Acoustic Survey Tabs

Summary Results

Number of Surveys

Table 1. Summary of the number of surveys undertaken in 2023, and the number of surveys examined in the estimation of spawning stock biomass (SSB) for the Atlantic herring 4VWX stock and coastal component complexes. Numbers in brackets indicate the number of surveys excluded from total biomass estimates.

Spawning Grounds Number of Surveys Notes
Offshore Banks 0
Scots Bay 11
German Bank 7
Seal Island 7
Spectacle Buoy 6
Trinity Ledge 5
Little Hope 6 4 used
Eastern Shore 5 3 used
Glace Bay 0
Total 47

Survey Dates

Table 2. Summary of completed herring acoustic surveys in 2023 with interval (days) between surveys on the same grounds, and the number of boats with acoustic systems.

Location of Survey Survey Date Interval (days) Acoustic Boats
Scots Bay #1 2023-05-22 NA 4
Scots Bay #2 2023-06-06 15 8
Scots Bay #3 2023-06-18 12 4
Scots Bay #4 2023-07-02 14 6
Scots Bay #5 2023-07-16 14 6
Scots Bay #6 2023-07-30 14 7
Scots Bay #7 2023-08-13 14 6
Scots Bay #8 2023-08-27 14 8
Scots Bay #9 2023-09-10 14 8
Scots Bay #10 2023-09-24 14 4
Scots Bay #11 2023-10-09 15 4
Trinity Ledge #1 2023-08-06 NA 1
Trinity Ledge #2 2023-08-16 10 1
Trinity Ledge #3 2023-08-27 11 1
Trinity Ledge #4 2023-09-08 12 1
Trinity Ledge #5 2023-09-20 12 1
Spec Buoy #1 2023-08-07 NA 1
Spec Buoy #2 2023-08-17 10 1
Spec Buoy #3 2023-08-28 11 1
Spec Buoy #4 2023-09-03 6 1
Spec Buoy #5 2023-09-12 9 1
Spec Buoy #6 2023-09-22 10 1
German Bank #1 2023-08-06 NA 5
German Bank #2 2023-08-20 14 9
German Bank #3 2023-09-03 14 9
German Bank #4 2023-09-13 10 9
German Bank #5 2023-09-27 14 7
German Bank #6 2023-10-11 14 5
German Bank #7 2023-10-24 13 8
Seal Island #1 2023-08-07 NA 5
Seal Island #2 2023-08-21 14 9
Seal Island #3 2023-09-04 14 9
Seal Island #4 2023-09-14 10 9
Seal Island #5 2023-09-27 13 2
Seal Island #6 2023-10-12 15 5
Seal Island #7 2023-10-25 13 7
Little Hope #1 2023-08-28 NA 2
Little Hope #2 2023-09-13 16 4
Little Hope #3 2023-09-26 13 4
Little Hope #4 2023-10-07 11 2
Little Hope #5 2023-10-17 10 2
Little Hope #6 2023-10-30 13 1
Eastern Shore #1 2023-09-23 NA 3
Eastern Shore #2 2023-10-03 10 4
Eastern Shore #3 2023-10-13 10 3
Eastern Shore #4 2023-10-27 14 2
Eastern Shore #5 2023-11-07 11 2

SWNS/BoF Time-Series

Figure. Trends in herring SSB (adjusted for turnover) from acoustic surveys areas with 95% confidence intervals in Scots Bay (red) and German Bank (black) areas.

Figure. Acoustic index of SSB (in thousands of metric tons) (with 95% confidence intervals; black Line), the 3-year moving average (red line), the overall average since 1999 (dashed purple line), and the Limit Reference Point for the Southwest Nova Scotia/Bay of Fundy spawning component (revised 2005–2010 German Bank and Scots Bay average; dashed blue line).

Scots Bay

Summary

Table. Summary of the 2023 Scots Bay spawning ground acoustic survey data and associated biomass estimates for Main Box, North Box, and East Box areas. This summary includes both systematic and ad-hoc surveys.

Location Date Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Unadjusted Biomass (t) Standard Error (t) St. Err % Adjusted Biomass (t)
Scots Bay #1 2023-05-22 -35.5000 687 -48.84 47,629 14,110 44 47,629
Scots Bay #2 2023-06-06 -35.0776 624 -45.11 98,726 43,571 70 92,916
Scots Bay #3 2023-06-18 -35.0369 676 -51.45 29,417 6,886 45 12,696
Scots Bay #4 2023-07-02 -34.7408 661 -53.65 9,330 4,927 53 3,619
Scots Bay #5 2023-07-16 -35.5000 647 -51.31 17,387 8,824 52 16,022
Scots Bay #6 2023-07-30 -35.5000 619 -58.01 3,474 720 21 1,093
Scots Bay #7 2023-08-13 -35.5000 623 -59.01 2,777 768 28 2,247
Scots Bay #8 2023-08-27 -35.1054 609 -60.88 1,612 226 14 1,224
Scots Bay #9 2023-09-10 -35.1434 608 -57.91 3,219 469 15 0
Scots Bay #10 2023-09-24 -34.8118 646 -59.22 2,340 1,247 53 0
Scots Bay #11 2023-10-09 -35.5000 664 -59.70 2,521 358 14 0
Summary 642 -55.01 218,431 47,436 22 177,447

Area Plot

Figure. Plots of Transects and area buffer for each survey.

Length Frequency

Figure. Length distribution used for calculation of TS for the Scots Bay acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Scots Bay surveys in 2023 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2023 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Scots Bay #1 May - 22 -35.5000
Scots Bay #2 15 Jun - 6 9 2 45 1769 277 159 -35.0776 165 -35.1435
Scots Bay #3 12 Jun - 18 9 3 59 1556 272 152 -35.0369 168 -35.2187
Scots Bay #4 14 Jul - 2 9 3 58 1723 243 114 -34.7408 179 -35.4909
Scots Bay #5 14 Jul - 16 -35.5000
Scots Bay #6 14 Jul - 30 -35.5000
Scots Bay #7 14 Aug - 13 -35.5000
Scots Bay #8 14 Aug - 27 12 6 158 2335 260 141 -35.1054 176 -35.4216
Scots Bay #9 14 Sep - 10 12 7 180 2277 262 145 -35.1434 177 -35.4273
Scots Bay #10 14 Sep - 24 6 2 56 1069 245 117 -34.8118 175 -35.3885
Scots Bay #11 15 Oct - 9 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2023 Scots Bay acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 Scots Bay acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

adjusted SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 Scots Bay acoustic survey by week number. SSB values were adjusted for turnover to decrease the chance of double counting. (0) indicates that a surveyed occurred, but due to double-counting these individuals were removed.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-05-22 BP_T02 -35.5 -55.5302 40.4911 0.0616 6,821.3667
ScotsBayMainBox 2023-05-22 BP_T01 -35.5 -56.6896 39.2764 0.0486 5,223.2168
ScotsBayMainBox 2023-05-22 FM_T01 -35.5 -52.2187 37.5104 0.1425 14,622.6584
ScotsBayMainBox 2023-05-22 MS_T01 -35.5 -69.6278 48.5446 0.0020 265.5322
ScotsBayMainBox 2023-05-22 SL_T01 -35.5 -60.0776 45.2203 0.0193 2,394.0513
ScotsBayMainBox 2023-05-22 SL_T02 -35.5 -59.8633 39.9995 0.0230 2,515.1377
ScotsBayNorthBox 2023-05-24 FM_T02 -35.5 -52.9524 18.1148 0.0490 1,349.2542
ScotsBayNorthBox 2023-05-24 FM_T03 -35.5 -62.2752 16.3914 0.0063 157.6946
ScotsBayNorthBox 2023-05-24 FM_T04 -35.5 -63.3631 14.8777 0.0054 122.7516
ScotsBayEastBox 2023-05-23 MS_T02 -35.5 -50.6962 11.3603 0.1548 3,809.6107
ScotsBayEastBox 2023-05-23 MS_T03 -35.5 -49.1044 13.6614 0.1857 5,496.1319
ScotsBayEastBox 2023-05-23 MS_T04 -35.5 -50.6557 15.5720 0.1140 3,845.2732
ScotsBayEastBox 2023-05-23 MS_T05 -35.5 -56.4782 17.5771 0.0264 1,006.1755
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-06-06 C1_T01 -35.0776 -59.8055 44.6833 0.0384 2,099.7679
ScotsBayMainBox 2023-06-06 C1_T02 -35.0776 -59.1550 37.8761 0.0526 2,439.0371
ScotsBayMainBox 2023-06-06 FM_T01 -35.0776 -56.8549 42.3486 0.0798 4,142.1870
ScotsBayMainBox 2023-06-06 FM_T02 -35.0776 -47.1917 35.7292 0.8757 38,331.3595
ScotsBayMainBox 2023-06-06 LJ_T01 -35.0776 -58.9638 48.0756 0.0433 2,548.8148
ScotsBayMainBox 2023-06-06 LJ_T02 -35.0776 -65.6217 41.8691 0.0107 550.2357
ScotsBayMainBox 2023-06-06 LM_T01 -35.0776 -59.9810 47.9440 0.0343 2,016.6065
ScotsBayMainBox 2023-06-06 LM_T02 -35.0776 -63.5482 40.4255 0.0179 886.9590
ScotsBayMainBox 2023-06-06 MS_T01 -35.0776 -59.6004 44.6869 0.0402 2,201.3285
ScotsBayMainBox 2023-06-06 MS_T02 -35.0776 -56.8050 38.9530 0.0878 4,190.0969
ScotsBayMainBox 2023-06-06 SL_T01 -35.0776 -62.0799 46.8223 0.0217 1,243.7310
ScotsBayMainBox 2023-06-06 SL_T02 -35.0776 -61.8864 39.6689 0.0268 1,300.4166
ScotsBayNorthBox 2023-06-06 BP_T01 -35.0776 -58.2977 8.2731 0.0324 416.5925
ScotsBayNorthBox 2023-06-06 BP_T02 -35.0776 -48.0319 17.7092 0.1607 4,428.8573
ScotsBayNorthBox 2023-06-06 BP_T03 -35.0776 -59.1444 16.2430 0.0136 342.7967
ScotsBayNorthBox 2023-06-06 BP_T04 -35.0776 -50.0360 13.9554 0.1285 2,791.7754
ScotsBayEastBox 2023-06-06 TM_T01 -35.0776 -43.6471 12.0516 0.6834 17,616.1501
ScotsBayEastBox 2023-06-06 TM_T02 -35.0776 -52.9532 13.6042 0.0710 2,066.8052
ScotsBayEastBox 2023-06-06 TM_T03 -35.0776 -47.3050 15.8755 0.2235 7,587.8596
ScotsBayEastBox 2023-06-06 TM_T04 -35.0776 -54.2749 17.7198 0.0402 1,524.5088
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-06-18 BP_T01 -35.0369 -63.1418 45.8262 0.0085 1,045.8973
ScotsBayMainBox 2023-06-18 BP_T02 -35.0369 -59.8669 40.1904 0.0205 2,223.2269
ScotsBayMainBox 2023-06-18 LB_T01 -35.0369 -60.6936 43.1064 0.0158 1,837.8635
ScotsBayMainBox 2023-06-18 LB_T02 -35.0369 -60.4537 37.5429 0.0192 1,942.2215
ScotsBayMainBox 2023-06-18 LJ_T01 -35.0369 -63.0662 47.5836 0.0083 1,064.2767
ScotsBayMainBox 2023-06-18 SL_T01 -35.0369 -54.6929 36.5731 0.0742 7,317.7521
ScotsBayNorthBox 2023-06-18 SL_T02 -35.0369 -43.1683 18.7113 0.4282 9,289.5548
ScotsBayNorthBox 2023-06-18 SL_T03 -35.0369 -60.2062 17.2153 0.0092 183.7423
ScotsBayNorthBox 2023-06-18 SL_T04 -35.0369 -60.3768 16.1823 0.0094 176.6628
ScotsBayEastBox 2023-06-18 LJ_T02 -35.0369 -60.1548 11.8681 0.0152 396.1830
ScotsBayEastBox 2023-06-18 LJ_T03 -35.0369 -63.4445 14.3101 0.0059 185.7489
ScotsBayEastBox 2023-06-18 LJ_T04 -35.0369 -55.2567 14.3738 0.0387 1,223.7881
ScotsBayEastBox 2023-06-18 LJ_T05 -35.0369 -52.1025 17.9144 0.0641 2,530.0477
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-07-02 BP_T01 -34.7408 -63.3656 46.2737 0.0086 907.8393
ScotsBayMainBox 2023-07-02 BP_T02 -34.7408 -62.2418 37.5610 0.0138 1,175.9558
ScotsBayMainBox 2023-07-02 C1_T01 -34.7408 -65.9747 43.8875 0.0050 497.8537
ScotsBayMainBox 2023-07-02 C1_T02 -34.7408 -67.5984 35.4920 0.0043 342.5582
ScotsBayMainBox 2023-07-02 LJ_T01 -34.7408 -63.5251 42.2521 0.0091 875.1141
ScotsBayMainBox 2023-07-02 LJ_T02 -34.7408 -56.3503 37.6893 0.0534 4,566.0988
ScotsBayMainBox 2023-07-02 TM_T01 -34.7408 -71.4137 48.1348 0.0013 142.3001
ScotsBayNorthBox 2023-07-02 LB_T01 -34.7408 -61.9497 15.0293 0.0085 149.1510
ScotsBayNorthBox 2023-07-02 LB_T02 -34.7408 -63.7483 16.0621 0.0053 98.5750
ScotsBayNorthBox 2023-07-02 LB_T03 -34.7408 -65.7109 17.4957 0.0031 62.7334
ScotsBayNorthBox 2023-07-02 LB_T04 -34.7408 -62.8196 18.9405 0.0055 122.0761
ScotsBayEastBox 2023-07-02 SL_T01 -34.7408 -82.5111 12.1141 0.0001 4.7421
ScotsBayEastBox 2023-07-02 SL_T02 -34.7408 -71.2286 14.0400 0.0017 63.7111
ScotsBayEastBox 2023-07-02 SL_T03 -34.7408 -68.9678 16.1290 0.0025 107.2249
ScotsBayEastBox 2023-07-02 SL_T04 -34.7408 -72.2354 18.9019 0.0010 50.5288
ScotsBayEastBox 2023-07-02 TM_T02 -34.7408 -65.7943 43.5185 0.0019 222.6622
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-07-16 FM_T01 -35.5 -59.1640 44.5981 0.0326 2,782.8711
ScotsBayMainBox 2023-07-16 FM_T02 -35.5 -69.2041 37.7360 0.0038 275.7292
ScotsBayMainBox 2023-07-16 LB_T01 -35.5 -59.4490 48.7703 0.0279 2,606.1329
ScotsBayMainBox 2023-07-16 LB_T02 -35.5 -63.1391 41.7055 0.0140 1,114.2517
ScotsBayMainBox 2023-07-16 LJ_T01 -35.5 -64.0231 46.2903 0.0103 909.0524
ScotsBayMainBox 2023-07-16 LJ_T02 -35.5 -54.1330 39.4092 0.1176 8,863.2580
ScotsBayMainBox 2023-07-16 SL_T01 -35.5 -68.4175 43.9903 0.0039 330.4783
ScotsBayMainBox 2023-07-16 SL_T02 -35.5 -74.2713 35.7402 0.0013 85.8552
ScotsBayNorthBox 2023-07-16 LM_T01 -35.5 -69.8791 19.3375 0.0013 29.9836
ScotsBayNorthBox 2023-07-16 LM_T02 -35.5 -70.8926 17.4755 0.0011 23.7434
ScotsBayNorthBox 2023-07-16 LM_T03 -35.5 -67.4222 16.0998 0.0027 52.7927
ScotsBayNorthBox 2023-07-16 LM_T04 -35.5 -70.5090 14.3913 0.0015 25.9359
ScotsBayEastBox 2023-07-16 C1_T01 -35.5 -73.8753 12.5077 0.0007 19.0031
ScotsBayEastBox 2023-07-16 C1_T02 -35.5 -66.6044 13.7089 0.0035 101.3720
ScotsBayEastBox 2023-07-16 C1_T03 -35.5 -70.1005 15.8534 0.0014 45.3218
ScotsBayEastBox 2023-07-16 C1_T04 -35.5 -65.8438 20.5072 0.0028 120.7743
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-07-30 C1_T01 -35.5 -64.5416 44.5949 0.0166 771.3970
ScotsBayMainBox 2023-07-30 C1_T02 -35.5 -75.0556 39.1953 0.0017 68.5285
ScotsBayMainBox 2023-07-30 FM_T01 -35.5 -66.9379 45.8371 0.0093 444.2669
ScotsBayMainBox 2023-07-30 FM_T02 -35.5 -68.3461 40.5074 0.0076 321.2340
ScotsBayMainBox 2023-07-30 LB_T01 -35.5 -69.4570 45.6941 0.0052 248.7311
ScotsBayMainBox 2023-07-30 LB_T02 -35.5 -71.8497 39.0728 0.0035 143.3712
ScotsBayMainBox 2023-07-30 LJ_T01 -35.5 -70.7757 46.9644 0.0038 183.5944
ScotsBayMainBox 2023-07-30 LJ_T02 -35.5 -72.5046 40.5722 0.0029 123.3022
ScotsBayMainBox 2023-07-30 LM_T01 -35.5 -66.1778 43.3320 0.0117 529.2426
ScotsBayMainBox 2023-07-30 LM_T02 -35.5 -74.2890 37.2996 0.0021 81.7588
ScotsBayMainBox 2023-07-30 MS_T01 -35.5 -71.9681 48.4266 0.0028 139.5152
ScotsBayMainBox 2023-07-30 MS_T02 -35.5 -70.1927 42.5264 0.0047 209.9752
ScotsBayMainBox 2023-07-30 SL_T01 -35.5 -72.7387 43.6110 0.0026 116.8336
ScotsBayMainBox 2023-07-30 SL_T02 -35.5 -73.7614 36.2375 0.0024 92.3191
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-08-13 C1_T01 -35.5 -69.4948 48.7992 0.0041 248.2411
ScotsBayMainBox 2023-08-13 C1_T02 -35.5 -74.4031 40.8603 0.0016 80.1746
ScotsBayMainBox 2023-08-13 FM_T01 -35.5 -64.0724 45.0841 0.0156 865.1842
ScotsBayMainBox 2023-08-13 FM_T02 -35.5 -72.1917 38.1838 0.0028 133.4066
ScotsBayMainBox 2023-08-13 LM_T01 -35.5 -65.8233 46.0690 0.0102 578.1189
ScotsBayMainBox 2023-08-13 LM_T02 -35.5 -74.4309 39.4862 0.0016 79.6629
ScotsBayMainBox 2023-08-13 MS_T01 -35.5 -71.7432 43.2743 0.0028 147.9206
ScotsBayMainBox 2023-08-13 MS_T02 -35.5 -72.6733 35.9405 0.0027 119.4044
ScotsBayMainBox 2023-08-13 SL_T01 -35.5 -71.1775 47.0114 0.0029 168.5015
ScotsBayMainBox 2023-08-13 SL_T02 -35.5 -72.7273 40.7179 0.0024 117.9272
ScotsBayMainBox 2023-08-13 TM_T01 -35.5 -70.9276 44.5111 0.0033 178.4785
ScotsBayMainBox 2023-08-13 TM_T02 -35.5 -75.6406 37.7040 0.0013 60.2965
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-08-27 BP_T01 -35.1054 -71.3421 42.3561 0.0038 144.8651
ScotsBayMainBox 2023-08-27 BP_T02 -35.1054 -75.3100 34.4969 0.0019 58.1004
ScotsBayMainBox 2023-08-27 C1_T01 -35.1054 -74.3107 46.3792 0.0017 73.1317
ScotsBayMainBox 2023-08-27 C1_T02 -35.1054 -75.0496 39.5239 0.0017 61.6897
ScotsBayMainBox 2023-08-27 FM_T01 -35.1054 -68.3551 43.9335 0.0073 288.1826
ScotsBayMainBox 2023-08-27 FM_T02 -35.1054 -73.7701 37.6219 0.0024 82.8265
ScotsBayMainBox 2023-08-27 LB_T01 -35.1054 -70.8547 48.1134 0.0037 162.0701
ScotsBayMainBox 2023-08-27 LB_T02 -35.1054 -75.3127 41.4844 0.0015 58.0641
ScotsBayMainBox 2023-08-27 LJ_T01 -35.1054 -71.1428 43.6781 0.0038 151.6688
ScotsBayMainBox 2023-08-27 LJ_T02 -35.1054 -75.6957 36.7852 0.0016 53.1628
ScotsBayMainBox 2023-08-27 LM_T01 -35.1054 -74.5725 46.4904 0.0016 68.8530
ScotsBayMainBox 2023-08-27 LM_T02 -35.1054 -74.0606 39.8729 0.0021 77.4672
ScotsBayMainBox 2023-08-27 MS_T01 -35.1054 -72.6647 47.3539 0.0025 106.8341
ScotsBayMainBox 2023-08-27 MS_T02 -35.1054 -75.8623 40.5627 0.0014 51.1619
ScotsBayMainBox 2023-08-27 SL_T01 -35.1054 -72.8580 45.4682 0.0025 102.1834
ScotsBayMainBox 2023-08-27 SL_T02 -35.1054 -74.4072 39.5026 0.0020 71.5252
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-09-10 BP_T01 -35.1434 -72.4448 43.9471 0.0028 113.1770
ScotsBayMainBox 2023-09-10 BP_T02 -35.1434 -72.7819 35.5922 0.0033 104.7241
ScotsBayMainBox 2023-09-10 C1_T01 -35.1434 -72.1014 45.0803 0.0030 122.4871
ScotsBayMainBox 2023-09-10 C1_T02 -35.1434 -76.2078 38.1673 0.0014 47.5834
ScotsBayMainBox 2023-09-10 FM_T01 -35.1434 -74.0172 46.6143 0.0019 78.7988
ScotsBayMainBox 2023-09-10 FM_T02 -35.1434 -69.1134 40.4771 0.0067 243.7221
ScotsBayMainBox 2023-09-10 LB_T01 -35.1434 -70.6187 42.5194 0.0045 172.3303
ScotsBayMainBox 2023-09-10 LB_T02 -35.1434 -70.4444 36.0063 0.0055 179.3871
ScotsBayMainBox 2023-09-10 LJ_T01 -35.1434 -66.3006 44.7707 0.0115 465.7790
ScotsBayMainBox 2023-09-10 LJ_T02 -35.1434 -69.9765 38.4824 0.0057 199.7960
ScotsBayMainBox 2023-09-10 LM_T01 -35.1434 -70.2484 46.6850 0.0044 187.6682
ScotsBayMainBox 2023-09-10 LM_T02 -35.1434 -69.6311 39.7822 0.0060 216.3346
ScotsBayMainBox 2023-09-10 MS_T01 -35.1434 -67.7150 45.7285 0.0081 336.3102
ScotsBayMainBox 2023-09-10 MS_T02 -35.1434 -66.7560 38.6878 0.0120 419.4061
ScotsBayMainBox 2023-09-10 SL_T01 -35.1434 -71.6492 48.0702 0.0031 135.9295
ScotsBayMainBox 2023-09-10 SL_T02 -35.1434 -70.0710 41.9593 0.0052 195.4927
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-09-24 C1_T01 -34.8118 -61.4503 42.8804 0.0169 1,401.1308
ScotsBayMainBox 2023-09-24 C1_T02 -34.8118 -73.6001 35.8089 0.0012 85.4074
ScotsBayMainBox 2023-09-24 FM_T01 -34.8118 -71.9660 47.9719 0.0013 124.4262
ScotsBayMainBox 2023-09-24 FM_T02 -34.8118 -68.8315 38.9808 0.0034 256.0721
ScotsBayMainBox 2023-09-24 LM_T01 -34.8118 -69.5751 46.2757 0.0024 215.7720
ScotsBayMainBox 2023-09-24 LM_T02 -34.8118 -71.8668 39.5437 0.0017 127.3003
ScotsBayMainBox 2023-09-24 MS_T01 -34.8118 -80.2143 45.2624 0.0002 18.6241
ScotsBayMainBox 2023-09-24 MS_T02 -34.8118 -72.4570 37.4851 0.0015 111.1253
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
ScotsBayMainBox 2023-10-09 FM_T01 -35.5 -66.3781 42.4693 0.0065 542.2625
ScotsBayMainBox 2023-10-09 FM_T02 -35.5 -67.9984 35.4947 0.0054 373.4024
ScotsBayMainBox 2023-10-09 LB_T01 -35.5 -69.4278 43.9885 0.0031 268.6809
ScotsBayMainBox 2023-10-09 LB_T02 -35.5 -71.0102 37.9985 0.0025 186.6377
ScotsBayMainBox 2023-10-09 LJ_T01 -35.5 -69.9073 46.3641 0.0026 240.5964
ScotsBayMainBox 2023-10-09 LJ_T02 -35.5 -68.3025 39.3921 0.0045 348.1517
ScotsBayMainBox 2023-10-09 SL_T01 -35.5 -70.4164 49.3690 0.0022 213.9826
ScotsBayMainBox 2023-10-09 SL_T02 -35.5 -68.3160 42.7254 0.0041 347.0657

Notes

Scots Bay survey #4 had >10% immature individuals. This resulted in a 70t reduction in the estimated observed spawning biomass for that survey.

German Bank

Summary

Table. Summary of the 2023 German Bank spawning ground acoustic survey data and associated biomass estimates. Adjusted biomass numbers refer to adjustment for turnover.

Location Date Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Unadjusted Biomass (t) Standard Error (t) St. Err % Adjusted Biomass
German Bank #1 2023-08-06 -35.5000 505 -59.48 2,021 198 10 2,021
German Bank #2 2023-08-20 -35.1776 796 -59.02 3,288 837 25 2,894
German Bank #3 2023-09-03 -35.2314 794 -55.00 8,372 2,017 24 7,658
German Bank #4 2023-09-13 -35.0659 797 -52.31 15,011 5,316 35 12,497
German Bank #5 2023-09-27 -35.0837 802 -52.82 13,503 2,307 17 9,978
German Bank #6 2023-10-11 -35.5000 820 -50.36 26,754 14,629 55 23,581
German Bank #7 2023-10-24 -35.5000 797 -54.01 11,241 1,852 16 4,970
Summary 759 -54.71 80,190 15,994 20 63,600

Area Plot

Figure. Plots of Transects and area buffer for each survey.

Length Frequency

Figure. Length distribution used for calculation of TS for the German Bank acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Figure. Length distribution used for calculation of TS for the Scots Bay acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during German Bank surveys in 2023 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2023 fish sampled for Scots Bay by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
German Bank #1 Aug - 6 -35.5000
German Bank #2 14 Aug - 20 2 2 49 370 285 173 -35.1776 164 -35.0931
German Bank #3 14 Sep - 3 14 5 136 2843 277 165 -35.2314 171 -35.2843
German Bank #4 10 Sep - 13 11 3 78 2283 280 163 -35.0659 163 -35.0659
German Bank #5 14 Sep - 27 2 1 29 351 280 163 -35.0837 163 -35.0837
German Bank #6 14 Oct - 11 -35.5000
German Bank #7 13 Oct - 24 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2023 German Bank acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 German Bank acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

adjusted SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands from 1999 to 2022 German Bank acoustic survey by week number. SSB values were adjusted for turnover to decrease the chance of double counting. (0) indicates that a surveyed occurred, but due to double-counting these individuals were removed.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2023-08-06 LB_T01 -35.5 -70.9765 37.9280 0.0029 143.0740
German 2023-08-06 LB_T02 -35.5 -68.1202 38.4266 0.0054 276.1825
German 2023-08-06 LJ_T01 -35.5 -68.4530 37.0676 0.0052 255.8090
German 2023-08-06 LJ_T02 -35.5 -71.0088 36.8879 0.0029 142.0138
German 2023-08-06 LM_T01 -35.5 -71.1854 37.3475 0.0028 136.3541
German 2023-08-06 LM_T02 -35.5 -68.3195 37.6563 0.0053 263.7914
German 2023-08-06 MS_T01 -35.5 -71.2936 39.1266 0.0026 133.0006
German 2023-08-06 MS_T02 -35.5 -67.9299 39.7283 0.0055 288.5511
German 2023-08-06 SL_T01 -35.5 -69.5373 38.8966 0.0039 199.2882
German 2023-08-06 SL_T02 -35.5 -69.8975 39.3293 0.0035 183.4264
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2023-08-20 BP_T01 -35.1776 -71.6732 36.5106 0.0043 178.3017
German 2023-08-20 BP_T02 -35.1776 -73.0673 36.4864 0.0031 129.3427
German 2023-08-20 C1_T01 -35.1776 -72.7958 40.6019 0.0030 137.6883
German 2023-08-20 C1_T02 -35.1776 -74.3510 40.8576 0.0021 96.2450
German 2023-08-20 FM_T01 -35.1776 -65.9782 38.5962 0.0149 661.6917
German 2023-08-20 FM_T02 -35.1776 -71.9102 38.6699 0.0038 168.8308
German 2023-08-20 LB_T01 -35.1776 -72.4858 38.5054 0.0033 147.8737
German 2023-08-20 LB_T02 -35.1776 -76.0163 38.1939 0.0015 65.5913
German 2023-08-20 LJ_T01 -35.1776 -71.9843 37.0997 0.0039 165.9762
German 2023-08-20 LJ_T02 -35.1776 -77.8218 37.1928 0.0010 43.2803
German 2023-08-20 LM_T01 -35.1776 -65.4757 38.1433 0.0170 742.8621
German 2023-08-20 LM_T02 -35.1776 -70.6626 38.1207 0.0051 225.0148
German 2023-08-20 MS_T01 -35.1776 -72.2806 38.9235 0.0035 155.0301
German 2023-08-20 MS_T02 -35.1776 -77.4158 38.8820 0.0011 47.5215
German 2023-08-20 SL_T01 -35.1776 -74.0867 40.5256 0.0022 102.2833
German 2023-08-20 SL_T02 -35.1776 -75.8270 40.2508 0.0015 68.5125
German 2023-08-20 TM_T01 -35.1776 -76.0614 37.7450 0.0015 64.9136
German 2023-08-20 TM_T02 -35.1776 -74.7807 37.6671 0.0020 87.1784
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2023-09-03 BP_T01 -35.2314 -70.4100 36.6752 0.0057 241.1131
German 2023-09-03 BP_T02 -35.2314 -69.9981 36.7697 0.0063 265.1047
German 2023-09-03 C1_T01 -35.2314 -65.6330 41.2128 0.0153 724.3127
German 2023-09-03 C1_T02 -35.2314 -75.6782 40.2689 0.0016 71.6805
German 2023-09-03 FM_T01 -35.2314 -65.7457 38.5012 0.0160 705.7552
German 2023-09-03 FM_T02 -35.2314 -72.1440 38.2258 0.0037 161.7416
German 2023-09-03 LB_T01 -35.2314 -73.3915 38.0773 0.0028 121.3602
German 2023-09-03 LB_T02 -35.2314 -73.4541 37.8970 0.0028 119.6216
German 2023-09-03 LJ_T01 -35.2314 -64.2196 36.4336 0.0240 1,002.9256
German 2023-09-03 LJ_T02 -35.2314 -74.2585 36.7611 0.0024 99.3962
German 2023-09-03 LM_T01 -35.2314 -67.3453 38.2167 0.0111 488.3051
German 2023-09-03 LM_T02 -35.2314 -74.1206 37.9393 0.0024 102.6039
German 2023-09-03 MS_T01 -35.2314 -62.7228 40.0943 0.0308 1,415.6173
German 2023-09-03 MS_T02 -35.2314 -74.5298 39.6152 0.0021 93.3781
German 2023-09-03 SL_T01 -35.2314 -61.5982 42.1744 0.0379 1,834.0381
German 2023-09-03 SL_T02 -35.2314 -68.2257 40.3108 0.0086 398.7031
German 2023-09-03 TM_T01 -35.2314 -67.6350 36.5908 0.0109 456.8009
German 2023-09-03 TM_T02 -35.2314 -75.7890 37.0808 0.0016 69.8759
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2023-09-13 BP_T01 -35.0659 -59.1435 36.0612 0.0741 3,115.1341
German 2023-09-13 BP_T02 -35.0659 -73.9406 37.0204 0.0024 103.2210
German 2023-09-13 C1_T01 -35.0659 -68.5533 40.1229 0.0076 356.8629
German 2023-09-13 C1_T02 -35.0659 -69.0955 38.2997 0.0071 314.9762
German 2023-09-13 FM_T01 -35.0659 -60.6605 38.0608 0.0495 2,196.7255
German 2023-09-13 FM_T02 -35.0659 -71.9847 37.8787 0.0037 161.9418
German 2023-09-13 LB_T01 -35.0659 -61.9081 38.1018 0.0371 1,648.2159
German 2023-09-13 LB_T02 -35.0659 -73.8035 37.8068 0.0024 106.5310
German 2023-09-13 LJ_T01 -35.0659 -69.8491 36.9246 0.0062 264.7979
German 2023-09-13 LJ_T02 -35.0659 -63.2828 37.3127 0.0276 1,201.0101
German 2023-09-13 LM_T01 -35.0659 -71.1584 37.8886 0.0044 195.8779
German 2023-09-13 LM_T02 -35.0659 -78.5885 38.1589 0.0008 35.3981
German 2023-09-13 MS_T02 -35.0659 -71.6358 38.2415 0.0039 175.4889
German 2023-09-13 MS_T01 -35.0659 -57.5228 39.5512 0.0982 4,524.3039
German 2023-09-13 SL_T01 -35.0659 -69.6523 39.7486 0.0060 277.0747
German 2023-09-13 SL_T02 -35.0659 -73.0543 38.2011 0.0028 126.5899
German 2023-09-13 TM_T01 -35.0659 -72.2583 37.3227 0.0035 152.0558
German 2023-09-13 TM_T02 -35.0659 -76.6950 37.0725 0.0013 54.7432
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2023-09-27 BP_T01 -35.0837 -66.7411 36.8188 0.0099 547.5570
German 2023-09-27 BP_T02 -35.0837 -66.4347 37.0349 0.0106 587.5904
German 2023-09-27 C1_T01 -35.0837 -59.4000 40.8282 0.0484 2,968.5538
German 2023-09-27 C1_T02 -35.0837 -62.4173 39.6113 0.0249 1,481.8712
German 2023-09-27 FM_T01 -35.0837 -62.6432 38.7138 0.0242 1,406.7554
German 2023-09-27 FM_T02 -35.0837 -64.1141 38.3222 0.0174 1,002.6088
German 2023-09-27 LB_T01 -35.0837 -65.0163 38.4429 0.0141 814.5381
German 2023-09-27 LB_T02 -35.0837 -66.0709 37.9500 0.0112 638.9219
German 2023-09-27 LJ_T01 -35.0837 -66.1840 37.1848 0.0111 622.4974
German 2023-09-27 LJ_T02 -35.0837 -67.6761 37.2977 0.0079 441.4969
German 2023-09-27 LM_T01 -35.0837 -63.8494 37.1149 0.0191 1,065.6087
German 2023-09-27 LM_T02 -35.0837 -68.3709 37.4891 0.0067 376.2306
German 2023-09-27 MS_T01 -35.0837 -64.3274 38.7327 0.0164 954.5468
German 2023-09-27 MS_T02 -35.0837 -66.3877 38.3912 0.0103 593.9758
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2023-10-11 C1_T01 -35.5 -65.6922 39.2416 0.0094 784.4814
German 2023-10-11 C1_T02 -35.5 -72.9837 38.8177 0.0018 146.3635
German 2023-10-11 LB_T01 -35.5 -62.1763 38.2677 0.0217 1,762.6659
German 2023-10-11 LB_T02 -35.5 -59.9568 38.2545 0.0361 2,938.4423
German 2023-10-11 LJ_T01 -35.5 -63.6637 37.0720 0.0159 1,251.4971
German 2023-10-11 LJ_T02 -35.5 -70.7510 37.2694 0.0031 244.7390
German 2023-10-11 MS_T01 -35.5 -52.6323 39.2302 0.1903 15,869.8063
German 2023-10-11 MS_T02 -35.5 -61.9138 38.6679 0.0228 1,872.4656
German 2023-10-11 SL_T01 -35.5 -64.1639 39.7106 0.0132 1,115.3409
German 2023-10-11 SL_T02 -35.5 -65.7832 39.1285 0.0092 768.2037
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
German 2023-10-24 BP_T01 -35.5 -64.2276 38.1264 0.0217 1,068.0069
German 2023-10-24 BP_T02 -35.5 -67.4716 39.6710 0.0099 506.0222
German 2023-10-24 C1_T01 -35.5 -64.0163 39.0625 0.0223 1,121.2359
German 2023-10-24 C1_T02 -35.5 -64.5135 40.5576 0.0191 999.9557
German 2023-10-24 FM_T01 -35.5 -62.7178 36.7205 0.0319 1,512.0029
German 2023-10-24 FM_T02 -35.5 -63.3922 38.3005 0.0262 1,294.5146
German 2023-10-24 LB_T01 -35.5 -71.4112 38.0187 0.0042 204.2741
German 2023-10-24 LB_T02 -35.5 -63.1927 39.0567 0.0269 1,355.3887
German 2023-10-24 LJ_T01 -35.5 -68.1792 37.0306 0.0090 429.9384
German 2023-10-24 LJ_T02 -35.5 -68.0688 36.3959 0.0094 441.0164
German 2023-10-24 LM_T01 -35.5 -71.9376 37.8058 0.0037 180.9544
German 2023-10-24 LM_T02 -35.5 -66.8743 37.9064 0.0119 580.6367
German 2023-10-24 MS_T01 -35.5 -66.8419 38.0394 0.0119 584.9759
German 2023-10-24 MS_T02 -35.5 -66.7925 40.3633 0.0114 591.6716
German 2023-10-24 SL_T01 -35.5 -70.0941 40.2829 0.0053 276.6409
German 2023-10-24 SL_T02 -35.5 -74.8066 40.5000 0.0018 93.4695

Notes

German Bank Survey #2 had >10% immature individuals. This resulted in a 2t reduction in the estimated observed spawning biomass for that survey.

Seal Island

Summary

Table. Summary of the 2023 Seal Island spawning ground acoustic survey data and associated biomass estimates.

Location Date Interval (Days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Seal Island #1 2023-08-07 -35.5000 300 -60.59 929 177 19
Seal Island #2 2023-08-21 14 -35.1776 270 -59.97 897 181 20
Seal Island #3 2023-09-04 14 -35.0331 269 -58.93 1,099 245 22
Seal Island #4 2023-09-14 10 -35.1239 267 -53.32 4,045 2,507 62
Seal Island #5 2023-09-27 13 -34.4425 276 -42.59 42,269 29,803 71
Seal Island #6 2023-10-12 15 -35.5000 280 -48.33 14,607 9,918 68
Seal Island #7 2023-10-25 13 -35.5000 277 -59.57 1,087 420 39
Summary 277 -54.76 64,933 31,515 49

Length Frequency

Figure. Length distribution used for calculation of TS for the Seal Island acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Seal Island surveys in 2023 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2023 fish sampled for Seal Island by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Seal Island #1 Aug - 6 -35.5000
Seal Island #2 14 Aug - 20 3 1 18 709 242 104 -34.3898 156 -34.8926
Seal Island #3 14 Sep - 3 -35.5000
Seal Island #4 10 Sep - 13 3 1 30 590 277 158 -35.0331 163 -35.0903
Seal Island #5 14 Sep - 27 2 4 109 348 275 159 -35.1239 168 -35.2107
Seal Island #6 14 Oct - 11 5 1 24 864 272 133 -34.4425 145 -34.5734
Seal Island #7 13 Oct - 24 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2023 Seal Island acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Seal Island acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2023-08-07 LB_T03 -35.5 -73.0091 29.6689 0.0018 53.2513
SealIsland 2023-08-07 LB_T04 -35.5 -67.1008 29.5305 0.0069 207.5690
SealIsland 2023-08-07 LJ_T03 -35.5 -73.1915 28.8043 0.0017 51.0616
SealIsland 2023-08-07 LJ_T04 -35.5 -70.6319 28.3496 0.0032 92.0559
SealIsland 2023-08-07 LM_T03 -35.5 -74.6162 29.6111 0.0012 36.7807
SealIsland 2023-08-07 LM_T04 -35.5 -70.7562 29.1416 0.0030 89.4577
SealIsland 2023-08-07 MS_T03 -35.5 -70.8380 30.2790 0.0029 87.7884
SealIsland 2023-08-07 MS_T04 -35.5 -68.5671 30.3771 0.0048 148.0903
SealIsland 2023-08-07 SL_T03 -35.5 -75.7467 29.8525 0.0009 28.3510
SealIsland 2023-08-07 SL_T04 -35.5 -68.9720 29.9086 0.0044 134.9076
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2023-08-21 BP_T03 -35.1776 -66.6425 26.3407 0.0072 192.8002
SealIsland 2023-08-21 C1_T03 -35.1776 -67.7364 30.9205 0.0047 149.8720
SealIsland 2023-08-21 FM_T03 -35.1776 -68.2670 29.1013 0.0045 132.6367
SealIsland 2023-08-21 LB_T03 -35.1776 -69.6957 30.3315 0.0031 95.4535
SealIsland 2023-08-21 LJ_T03 -35.1776 -74.0583 28.7347 0.0012 34.9569
SealIsland 2023-08-21 LM_T03 -35.1776 -73.2630 29.2421 0.0014 41.9819
SealIsland 2023-08-21 MS_T03 -35.1776 -70.2779 29.9178 0.0027 83.4787
SealIsland 2023-08-21 SL_T03 -35.1776 -73.8071 30.6465 0.0012 37.0386
SealIsland 2023-08-21 TM_T03 -35.1776 -68.3937 29.1946 0.0043 128.8209
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2023-09-04 BP_T03 -35.0331 -64.5464 28.6408 0.0102 301.4167
SealIsland 2023-09-04 C1_T03 -35.0331 -73.4055 30.0452 0.0013 39.1977
SealIsland 2023-09-04 FM_T03 -35.0331 -67.2213 28.9514 0.0055 162.8097
SealIsland 2023-09-04 LB_T03 -35.0331 -68.8585 29.0406 0.0037 111.6748
SealIsland 2023-09-04 LJ_T03 -35.0331 -71.1205 28.1230 0.0023 66.3379
SealIsland 2023-09-04 LM_T03 -35.0331 -67.5796 28.7158 0.0051 149.9145
SealIsland 2023-09-04 MS_T03 -35.0331 -67.9362 29.5759 0.0045 138.0981
SealIsland 2023-09-04 SL_T03 -35.0331 -71.1867 30.2489 0.0021 65.3343
SealIsland 2023-09-04 TM_T03 -35.0331 -71.2328 28.7122 0.0022 64.6431
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2023-09-14 BP_T03 -35.1239 -66.7960 29.2201 0.0061 181.4843
SealIsland 2023-09-14 C1_T03 -35.1239 -73.5724 29.7727 0.0013 38.1245
SealIsland 2023-09-14 FM_T03 -35.1239 -68.5163 29.2007 0.0041 122.1262
SealIsland 2023-09-14 LB_T03 -35.1239 -65.0308 28.9273 0.0093 272.4950
SealIsland 2023-09-14 LJ_T03 -35.1239 -68.7906 28.7186 0.0039 114.6517
SealIsland 2023-09-14 LM_T03 -35.1239 -55.1048 29.5083 0.0896 2,678.9364
SealIsland 2023-09-14 MS_T03 -35.1239 -73.0273 29.8259 0.0014 43.2224
SealIsland 2023-09-14 SL_T03 -35.1239 -66.7567 29.4330 0.0061 183.1337
SealIsland 2023-09-14 TM_T03 -35.1239 -63.2509 28.4953 0.0142 410.5353
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2023-09-27 SL_T01 -34.4425 -69.2355 30.0099 0.0019 91.5902
SealIsland 2023-09-27 SL_T02 -34.4425 -47.9517 30.0370 0.2610 12,309.3028
SealIsland 2023-09-27 SL_T03 -34.4425 -64.9327 29.9484 0.0052 246.6812
SealIsland 2023-09-27 TM_T01 -34.4425 -62.9589 28.9699 0.0085 388.6093
SealIsland 2023-09-27 TM_T02 -34.4425 -44.2096 28.4381 0.6525 29,136.9362
SealIsland 2023-09-27 TM_T03 -34.4425 -69.0167 28.4690 0.0022 96.3238
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2023-10-12 C1_T03 -35.5 -59.9365 30.4606 0.0174 1,009.4863
SealIsland 2023-10-12 LB_T03 -35.5 -55.5358 28.9777 0.0504 2,780.7991
SealIsland 2023-10-12 LJ_T03 -35.5 -49.8037 28.6899 0.1904 10,408.2611
SealIsland 2023-10-12 MS_T03 -35.5 -67.8201 28.9917 0.0030 164.3388
SealIsland 2023-10-12 SL_T03 -35.5 -66.1067 30.0130 0.0043 243.8252
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SealIsland 2023-10-25 C1_T03 -35.5 -69.1115 30.3741 0.0033 120.6494
SealIsland 2023-10-25 FM_T03 -35.5 -70.9954 26.8493 0.0025 78.1875
SealIsland 2023-10-25 LB_T03 -35.5 -69.4028 29.0308 0.0033 112.8233
SealIsland 2023-10-25 LJ_T03 -35.5 -63.1736 27.8500 0.0143 473.4992
SealIsland 2023-10-25 LM_T03 -35.5 -70.2707 30.8651 0.0025 92.3858
SealIsland 2023-10-25 MS_T03 -35.5 -72.0227 31.3449 0.0017 61.7174
SealIsland 2023-10-25 MS_T04 -35.5 -69.0813 25.9544 0.0039 121.4926
SealIsland 2023-10-25 SL_T03 -35.5 -75.7731 31.4216 0.0007 26.0237

Notes

No additional notes for this area.

Trinity Ledge

Summary

Table. Summary of the 2023 Trinity Ledge spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Trinity Ledge #1 2023-08-06 -35.9495 9 -68.12 5 2 35
Trinity Ledge #2 2023-08-16 10 -35.7477 16 -53.39 272 131 48
Trinity Ledge #3 2023-08-27 11 -35.4667 13 -42.76 2,369 3,736 158
Trinity Ledge #4 2023-09-08 12 -35.9495 14 -54.01 225 288 128
Trinity Ledge #5 2023-09-20 12 -35.9495 27 -43.83 4,380 3,018 69
Summary 16 -52.42 7,251 4,813 66

Length Frequency

Figure. Length distribution used for calculation of TS for the Trinity Ledge acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Trinity Ledge surveys in 2023 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2023 fish sampled for Trinity Ledge by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Trinity Ledge #1 Aug - 6 -35.5000
Trinity Ledge #2 10 Aug - 16 1 2 55 45 278 169 -35.2982 173 -35.3378
Trinity Ledge #3 11 Aug - 27 1 3 87 59 272 152 -35.0173 166 -35.1563
Trinity Ledge #4 12 Sep - 8 -35.5000
Trinity Ledge #5 12 Sep - 20 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2023 Trinity Ledge acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Trinity Ledge acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2023-08-06 DD_T01 -35.9495 -77.2608 3.1116 0.0005 0.6315
TrinityLedgeTR1 2023-08-06 DD_T02 -35.9495 -82.3699 2.9567 0.0002 0.1947
TrinityLedgeTR1 2023-08-06 DD_T03 -35.9495 -74.8731 2.8271 0.0010 1.0943
TrinityLedgeTR1 2023-08-06 DD_T04 -35.9495 -75.0288 2.7768 0.0010 1.0558
TrinityLedgeTR1 2023-08-06 DD_T05 -35.9495 -88.6096 2.7916 0.0000 0.0463
TrinityLedgeTR1 2023-08-06 DD_T06 -35.9495 -72.6161 2.8278 0.0017 1.8401
TrinityLedgeTR1 2023-08-06 DD_T07 -35.9495 -81.0278 2.5970 0.0003 0.2653
TrinityLedgeTR1 2023-08-06 DD_T08 -35.9495 -88.1115 2.7548 0.0000 0.0519
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2023-08-16 DD_T01 -35.7477 -82.6393 1.6067 0.0005 0.3230
TrinityLedgeTR1 2023-08-16 DD_T02 -35.7477 -81.5126 1.7692 0.0006 0.4187
TrinityLedgeTR1 2023-08-16 DD_T03 -35.7477 -93.5296 2.1237 0.0000 0.0263
TrinityLedgeTR1 2023-08-16 DD_T04 -35.7477 -87.7982 2.1783 0.0001 0.0985
TrinityLedgeTR1 2023-08-16 DD_T05 -35.7477 -94.1785 2.0242 0.0000 0.0227
TrinityLedgeTR1 2023-08-16 DD_T06 -35.7477 -89.9912 2.1262 0.0001 0.0594
TrinityLedgeTR1 2023-08-16 DD_T07 -35.7477 -93.5861 1.8646 0.0000 0.0260
TrinityLedgeTR1 2023-08-16 DD_T08 -35.7477 -84.7478 2.1829 0.0002 0.1988
TrinityLedgeTR1 2023-08-16 DD_T09 -35.7477 -66.4237 2.8935 0.0127 13.5129
TrinityLedgeTR1 2023-08-16 DD_T10 -35.7477 -57.0319 2.7592 0.1158 117.4694
TrinityLedgeTR1 2023-08-16 DD_T11 -35.7477 -63.2066 3.1595 0.0244 28.3438
TrinityLedgeTR1 2023-08-16 DD_T12 -35.7477 -85.8933 3.2877 0.0001 0.1527
TrinityLedgeTR1 2023-08-16 DD_T13 -35.7477 -63.4860 3.0091 0.0240 26.5774
TrinityLedgeTR1 2023-08-16 DD_T14 -35.7477 -58.4809 3.0244 0.0757 84.1451
TrinityLedgeTR1 2023-08-16 DD_T15 -35.7477 -83.6624 3.3637 0.0002 0.2552
TrinityLedgeTR1 2023-08-16 DD_T16 -35.7477 -84.4187 5.5618 0.0001 0.2144
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2023-08-27 DD_T01 -35.4667 -61.5730 4.5591 0.0186 31.0981
TrinityLedgeTR1 2023-08-27 DD_T02 -35.4667 -71.9602 2.0155 0.0039 2.8445
TrinityLedgeTR1 2023-08-27 DD_T03 -35.4667 -72.6644 2.6775 0.0025 2.4187
TrinityLedgeTR1 2023-08-27 DD_T04 -35.4667 -55.7358 2.8931 0.1125 119.2476
TrinityLedgeTR1 2023-08-27 DD_T05 -35.4667 -43.0542 2.2655 2.6650 2,211.1503
TrinityLedgeTR1 2023-08-27 DD_T06 -35.4667 -81.3763 5.6090 0.0002 0.3254
TrinityLedgeTR1 2023-08-27 DD_T07 -35.4667 -75.6915 6.0792 0.0005 1.2047
TrinityLedgeTR1 2023-08-27 DD_T08 -35.4667 -80.6642 6.0080 0.0002 0.3834
TrinityLedgeTR1 2023-08-27 DD_T09 -35.4667 -86.3950 2.5357 0.0001 0.1025
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2023-09-08 DD_T01 -35.9495 -79.4121 4.1796 0.0004 0.6494
TrinityLedgeTR1 2023-09-08 DD_T02 -35.9495 -79.3511 4.3389 0.0004 0.6586
TrinityLedgeTR1 2023-09-08 DD_T03 -35.9495 -56.2109 1.9320 0.1808 135.7196
TrinityLedgeTR1 2023-09-08 DD_T04 -35.9495 -86.8979 2.1719 0.0001 0.1159
TrinityLedgeTR1 2023-09-08 DD_T05 -35.9495 -81.6547 4.8770 0.0002 0.3875
TrinityLedgeTR1 2023-09-08 DD_T06 -35.9495 -58.3598 5.1359 0.0415 82.7471
TrinityLedgeTR1 2023-09-08 DD_T07 -35.9495 -70.9635 5.8541 0.0020 4.5434
TrinityLedgeTR1 2023-09-08 DD_T08 -35.9495 -83.4916 4.6845 0.0001 0.2538
TrinityLedgeTR1 2023-09-08 DD_T09 -35.9495 -84.8321 3.9173 0.0001 0.1864
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
TrinityLedgeTR1 2023-09-20 DD_T01 -35.9495 -74.9401 8.6957 0.0009 3.3947
TrinityLedgeTR1 2023-09-20 DD_T02 -35.9495 -80.4068 5.9775 0.0004 0.9641
TrinityLedgeTR1 2023-09-20 DD_T03 -35.9495 -47.6642 6.6909 0.6548 1,812.9811
TrinityLedgeTR1 2023-09-20 DD_T04 -35.9495 -81.0614 1.7657 0.0011 0.8292
TrinityLedgeTR1 2023-09-20 DD_T05 -35.9495 -47.1696 3.9216 1.2519 2,031.6438
TrinityLedgeTR1 2023-09-20 DD_T06 -35.9495 -53.8570 3.9349 0.2675 435.6227
TrinityLedgeTR1 2023-09-20 DD_T07 -35.9495 -80.7286 2.0551 0.0011 0.8953
TrinityLedgeTR1 2023-09-20 DD_T08 -35.9495 -60.7131 6.5773 0.0330 89.8461
TrinityLedgeTR1 2023-09-20 DD_T09 -35.9495 -80.4460 6.7724 0.0003 0.9555
TrinityLedgeTR1 2023-09-20 DD_T10 -35.9495 -81.3285 6.7177 0.0003 0.7798
TrinityLedgeTR1 2023-09-20 DD_T11 -35.9495 -79.7163 6.3814 0.0004 1.1303
TrinityLedgeTR1 2023-09-20 DD_T12 -35.9495 -79.0100 5.5308 0.0006 1.3299

Notes

No additional notes for this area.

Spectacle Buoy

Summary

Table. Summary of the 2023 Spectacle Buoy spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Spectacle Buoy #1 2023-08-07 -35.9495 29 -63.72 48 18 37
Spectacle Buoy #2 2023-08-17 10 -35.9495 35 -49.59 1,510 1,022 68
Spectacle Buoy #3 2023-08-28 11 -35.9495 31 -50.52 1,071 383 36
Spectacle Buoy #4 2023-09-03 6 -35.9495 26 -48.60 1,392 1,026 74
Spectacle Buoy #5 2023-09-12 9 -35.9495 22 -55.90 226 108 48
Spectacle Buoy #6 2023-09-22 10 -35.9495 42 -63.76 70 13 19
Summary 31 -55.35 4,317 1,502 35

Table. Summary of the 2023 Eastern Shore spawning ground acoustic survey data and associated biomass estimates used towards an index of abundance. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Spectacle Buoy #1 2023-08-07 -35.9495 29 -63.72 48 18 37
Spectacle Buoy #2 2023-08-17 10 -35.9495 35 -49.59 1,510 1,022 68
Spectacle Buoy #4 2023-09-03 17 -35.9495 26 -48.60 1,392 1,026 74
Spectacle Buoy #5 2023-09-12 9 -35.9495 22 -55.90 226 108 48
Spectacle Buoy #6 2023-09-22 10 -35.9495 42 -63.76 70 13 19
Summary 31 -56.31 3,245 1,452 45

Length Frequency

Figure. Length distribution used for calculation of TS for the Spectacle Buoy acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Spectacle Buoy surveys in 2023 to determine proportion of individuals spawning for Spectacle Buoy acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2023 fish sampled for Spectacle Buoy by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Spec. Buoy #1 Aug - 7 -35.5000
Spec. Buoy #2 10 Aug - 17 1 1 32 73 252 123 -34.7766 177 -35.4387
Spec. Buoy #3 11 Aug - 28 1 1 28 60 268 150 -35.1096 171 -35.2905
Spec. Buoy #4 6 Sep - 3 1 1 31 53 273 156 -35.1081 169 -35.2251
Spec. Buoy #5 9 Sep - 12 1 1 26 44 272 161 -35.2656 176 -35.4121
Spec. Buoy #6 10 Sep - 22 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2023 Spectacle Buoy acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Spectacle Buoy acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2023-08-07 DD_T01 -35.9495 -69.9284 11.2823 0.0026 11.5456
SpecBuoySP1 2023-08-07 DD_T02 -35.9495 -67.4132 11.2283 0.0047 20.6032
SpecBuoySP1 2023-08-07 DD_T03 -35.9495 -73.3622 10.9785 0.0012 5.2364
SpecBuoySP1 2023-08-07 DD_T04 -35.9495 -78.7861 11.2381 0.0003 1.5019
SpecBuoySP1 2023-08-07 DD_T05 -35.9495 -78.9474 10.7794 0.0003 1.4471
SpecBuoySP1 2023-08-07 DD_T06 -35.9495 -71.9607 10.4313 0.0018 7.2309
SpecBuoySP1 2023-08-07 DD_T07 -35.9495 -82.4206 7.7893 0.0002 0.6504
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2023-08-17 DD_T01 -35.9495 -63.9674 11.9157 0.0096 55.0628
SpecBuoySP1 2023-08-17 DD_T02 -35.9495 -84.4108 10.2258 0.0001 0.4972
SpecBuoySP1 2023-08-17 DD_T03 -35.9495 -83.8380 11.1378 0.0001 0.5673
SpecBuoySP1 2023-08-17 DD_T04 -35.9495 -50.3565 12.5454 0.2099 1,264.5825
SpecBuoySP1 2023-08-17 DD_T05 -35.9495 -58.8024 12.2787 0.0307 180.8664
SpecBuoySP1 2023-08-17 DD_T06 -35.9495 -72.3607 11.4778 0.0014 7.9712
SpecBuoySP1 2023-08-17 DD_T07 -35.9495 -90.8277 3.0528 0.0001 0.1135
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2023-08-28 DD_T01 -35.9495 -69.2558 10.3476 0.0031 14.3362
SpecBuoySP1 2023-08-28 DD_T02 -35.9495 -67.6834 10.2813 0.0044 20.5909
SpecBuoySP1 2023-08-28 DD_T03 -35.9495 -64.2297 10.4429 0.0097 45.6086
SpecBuoySP1 2023-08-28 DD_T04 -35.9495 -57.0546 11.8828 0.0443 237.9902
SpecBuoySP1 2023-08-28 DD_T05 -35.9495 -55.0554 12.3695 0.0674 377.1129
SpecBuoySP1 2023-08-28 DD_T06 -35.9495 -55.0700 12.5353 0.0663 375.8471
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2023-09-03 DD_T01 -35.9495 -74.8492 9.4849 0.0009 3.2981
SpecBuoySP1 2023-09-03 DD_T02 -35.9495 -77.3566 10.0874 0.0005 1.8515
SpecBuoySP1 2023-09-03 DD_T03 -35.9495 -73.4306 9.7339 0.0012 4.5723
SpecBuoySP1 2023-09-03 DD_T04 -35.9495 -75.1196 9.7675 0.0008 3.0990
SpecBuoySP1 2023-09-03 DD_T05 -35.9495 -68.7057 10.3492 0.0035 13.5711
SpecBuoySP1 2023-09-03 DD_T06 -35.9495 -51.0731 12.0140 0.1725 786.8255
SpecBuoySP1 2023-09-03 DD_T07 -35.9495 -52.4074 6.0002 0.2541 578.6866
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2023-09-12 DD_T01 -35.9495 -89.1759 8.1070 0.0000 0.1061
SpecBuoySP1 2023-09-12 DD_T02 -35.9495 -82.2599 8.0016 0.0002 0.5216
SpecBuoySP1 2023-09-12 DD_T03 -35.9495 -81.8036 8.3082 0.0002 0.5794
SpecBuoySP1 2023-09-12 DD_T04 -35.9495 -58.9155 8.8599 0.0319 112.6720
SpecBuoySP1 2023-09-12 DD_T05 -35.9495 -60.7399 8.9680 0.0207 74.0256
SpecBuoySP1 2023-09-12 DD_T06 -35.9495 -63.7005 9.2000 0.0102 37.4381
SpecBuoySP1 2023-09-12 DD_T07 -35.9495 -83.4245 4.5140 0.0002 0.3989
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
SpecBuoySP1 2023-09-22 DD_T01 -35.9495 -74.8955 7.0373 0.0014 5.3612
SpecBuoySP1 2023-09-22 DD_T02 -35.9495 -74.8266 11.6107 0.0008 5.4469
SpecBuoySP1 2023-09-22 DD_T03 -35.9495 -71.9993 12.0969 0.0016 10.4443
SpecBuoySP1 2023-09-22 DD_T04 -35.9495 -74.8969 12.1469 0.0008 5.3595
SpecBuoySP1 2023-09-22 DD_T05 -35.9495 -69.0012 11.8850 0.0032 20.8299
SpecBuoySP1 2023-09-22 DD_T06 -35.9495 -70.6906 12.0951 0.0021 14.1173
SpecBuoySP1 2023-09-22 DD_T07 -35.9495 -73.1273 9.2657 0.0016 8.0553

Notes

No additional notes for this area.

Little Hope

Summary

Table. Summary of the 2023 Little Hope spawning ground acoustic survey data and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Little Hope #1 2023-08-28 -35.3990 8 -48.53 4,693 118 30
Little Hope #2 2023-09-13 16 -35.3661 14 -48.12 23,458 371 50
Little Hope #3 2023-09-26 13 -35.3911 3 -43.21 18,115 139 26
Little Hope #4 2023-10-07 11 -35.1643 1 -54.74 911 3 23
Little Hope #5 2023-10-17 10 -35.9495 6 -54.65 19,476 19 23
Little Hope #6 2023-10-30 13 -35.9495 4 -39.18 1,920 314 16
Summary 6 -48.07 68,573 7,324 11

Length Frequency

Figure. Length distribution used for calculation of TS for the Little Hope acoustic surveys with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Little Hope surveys in 2023 to determine proportion of individuals spawning for Little Hope acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2023 fish sampled for Little Hope by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Little Hope #1 Aug - 28 1 1 30 104 285 164 -34.9496 153 -34.8163
Little Hope #2 16 Sep - 13 1 1 29 101 275 151 -34.9167 161 -35.0254
Little Hope #3 13 Sep - 26 1 1 27 298 179 -34.9417 154 -34.8355
Little Hope #4 10 Oct - 6 1 1 27 102 277 147 -34.7149 152 -34.7704
Little Hope #5 11 Oct - 17 -35.5000
Little Hope #6 13 Oct - 30 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2023 Little Hope acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Little Hope acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2023-08-28 AS_T01 -35.399 -61.7397 1.9565 0.0195 18.8246
LittleHopeLH1 2023-08-28 AS_T02 -35.399 -58.6368 2.6964 0.0289 38.4606
LittleHopeLH1 2023-08-28 AS_T03 -35.399 -55.8602 2.0855 0.0708 72.8906
LittleHopeLH1 2023-08-28 AS_T04 -35.399 -57.3567 2.6902 0.0389 51.6437
LittleHopeLH1 2023-08-28 AS_T05 -35.399 -55.2550 3.3278 0.0510 83.7908
LittleHopeLH1 2023-08-28 AS_T06 -35.399 -53.6499 2.0079 0.1223 121.2570
LittleHopeLH1 2023-08-28 AS_T07 -35.399 -65.8490 1.6492 0.0090 7.3080
LittleHopeLH2 2023-08-29 SH_T01 -35.399 -59.1628 1.7559 0.0569 34.0733
LittleHopeLH2 2023-08-29 SH_T02 -35.399 -39.9030 2.9840 2.8233 2,873.4085
LittleHopeLH2 2023-08-29 SH_T03 -35.399 -55.9998 4.1034 0.0504 70.5843
LittleHopeLH2 2023-08-29 SH_T04 -35.399 -58.5206 4.1615 0.0278 39.5035
LittleHopeLH2 2023-08-29 SH_T05 -35.399 -57.4867 4.3141 0.0341 50.1212
LittleHopeLH2 2023-08-29 SH_T06 -35.399 -58.4275 3.8931 0.0304 40.3589
LittleHopeLH2 2023-08-29 SH_T07 -35.399 -61.5209 2.5532 0.0227 19.7973
LittleHopeLH3 2023-08-28 AS_T08 -35.399 -53.5863 3.8480 0.0926 123.0459
LittleHopeLH3 2023-08-28 AS_T09 -35.399 -50.9028 4.0622 0.1627 228.2532
LittleHopeLH3 2023-08-28 AS_T10 -35.399 -50.3784 3.9015 0.1911 257.5450
LittleHopeLH3 2023-08-28 AS_T11 -35.399 -51.9204 3.0685 0.1704 180.5729
LittleHopeLH3 2023-08-28 AS_T12 -35.399 -53.2357 3.1431 0.1229 133.3905
LittleHopeLH3 2023-08-28 AS_T13 -35.399 -51.1003 3.2769 0.1927 218.1041
LittleHopeLH3 2023-08-28 AS_T14 -35.399 -59.6518 2.1644 0.0407 30.4447
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2023-09-13 SH_T01 -35.3661 -52.7162 2.1795 0.1966 259.5942
LittleHopeLH1 2023-09-13 SH_T02 -35.3661 -54.4477 2.3305 0.1234 174.2375
LittleHopeLH1 2023-09-13 SH_T03 -35.3661 -57.4181 4.0665 0.0357 87.9246
LittleHopeLH1 2023-09-13 SH_T04 -35.3661 -56.4399 3.3627 0.0541 110.1345
LittleHopeLH1 2023-09-13 SH_T05 -35.3661 -59.2211 4.5149 0.0212 58.0499
LittleHopeLH1 2023-09-13 SH_T06 -35.3661 -60.2722 4.0252 0.0187 45.5718
LittleHopeLH1 2023-09-13 SH_T07 -35.3661 -66.0440 2.8020 0.0071 12.0645
LittleHopeLH2 2023-09-14 AS_T01 -35.3661 -64.7335 1.1602 0.0286 11.5418
LittleHopeLH2 2023-09-14 AS_T02 -35.3661 -54.9079 1.8915 0.1684 110.8741
LittleHopeLH2 2023-09-14 AS_T03 -35.3661 -49.0182 1.7699 0.6985 430.3245
LittleHopeLH2 2023-09-14 AS_T04 -35.3661 -41.3380 4.2658 1.6989 2,522.4210
LittleHopeLH2 2023-09-14 AS_T05 -35.3661 -39.4154 4.2726 2.6408 3,927.2216
LittleHopeLH2 2023-09-14 AS_T06 -35.3661 -41.8560 4.0130 1.6028 2,238.8304
LittleHopeLH2 2023-09-14 AS_T07a -35.3661 -56.9538 1.0935 0.1819 69.2220
LittleHopeLH2 2023-09-14 AS_T07b -35.3661 -44.2298 2.4368 1.5282 1,296.1171
LittleHopeLH2 2023-09-14 AS_T08 -35.3661 -44.9616 1.7194 1.8299 1,095.1208
LittleHopeLH2 2023-09-14 AS_T09 -35.3661 -48.7762 1.3226 0.9883 454.9874
LittleHopeLH2 2023-09-14 AS_T10 -35.3661 -50.6207 1.1281 0.7577 297.5408
LittleHopeLH2 2023-09-14 AS_T11 -35.3661 -50.9439 1.3217 0.6004 276.2030
LittleHopeLH2 2023-09-14 AS_T12 -35.3661 -52.7322 1.7641 0.2980 182.9776
LittleHopeLH2 2023-09-14 AS_T13 -35.3661 -69.2518 0.5053 0.0232 4.0779
LittleHopeLH3 2023-09-14 SH_T08 -35.3661 -59.3592 0.8073 0.0727 39.7832
LittleHopeLH3 2023-09-14 SH_T09 -35.3661 -50.6249 3.0836 0.1423 297.2589
LittleHopeLH3 2023-09-14 SH_T10 -35.3661 -49.6065 2.9770 0.1863 375.8116
LittleHopeLH3 2023-09-14 SH_T11 -35.3661 -52.5817 2.5729 0.1087 189.4290
LittleHopeLH3 2023-09-14 SH_T12 -35.3661 -51.0134 2.7816 0.1442 271.8207
LittleHopeLH3 2023-09-14 SH_T13 -35.3661 -57.8575 2.5037 0.0331 56.2168
LittleHopeLH4 2023-09-13 E2_T01 -35.3661 -57.2442 4.6456 0.0890 229.2241
LittleHopeLH4 2023-09-13 E2_T02 -35.3661 -56.5891 5.7458 0.0837 266.5449
LittleHopeLH4 2023-09-13 E2_T03 -35.3661 -51.6828 11.1710 0.1332 824.8939
LittleHopeLH4 2023-09-13 E2_T04 -35.3661 -48.3594 9.1144 0.3509 1,773.1459
LittleHopeLH4 2023-09-13 E2_T05 -35.3661 -48.5917 6.2820 0.4826 1,680.7883
LittleHopeLH4 2023-09-13 E2_T06 -35.3661 -54.8355 6.8970 0.1044 399.1480
LittleHopeLH4 2023-09-13 E2_T07 -35.3661 -47.7144 6.6856 0.5550 2,057.0600
LittleHopeLH4 2023-09-13 E2_T08 -35.3661 -58.1969 6.7869 0.0489 184.0741
LittleHopeLH4 2023-09-13 E2_T09 -35.3661 -56.1990 4.5508 0.1156 291.5958
LittleHopeLH4 2023-09-13 E2_T10 -35.3661 -64.2742 1.8398 0.0445 45.4221
LittleHopeLH5 2023-09-14 E8_T10 -35.3661 -54.3393 0.6455 0.1869 40.8277
LittleHopeLH5 2023-09-14 E8_T12 -35.3661 -51.3134 1.0597 0.2285 81.9500
LittleHopeLH5 2023-09-14 E8_T13 -35.3661 -52.8745 1.1949 0.1414 57.2057
LittleHopeLH5 2023-09-14 E8_T14 -35.3661 -53.0655 1.0758 0.1503 54.7445
LittleHopeLH5 2023-09-14 E8_T15 -35.3661 -54.1892 1.2243 0.1020 42.2641
LittleHopeLH5 2023-09-14 E8_T16 -35.3661 -54.2860 1.2337 0.0990 41.3324
LittleHopeLH5 2023-09-14 E8_T17 -35.3661 -51.4664 1.4205 0.1645 79.1127
LittleHopeLH5 2023-09-14 E8_T18 -35.3661 -53.6316 1.5176 0.0935 48.0539
LittleHopeLH5 2023-09-14 E8_T19 -35.3661 -65.2956 0.1502 0.0645 3.2759
LittleHopeLH6 2023-09-14 E8_T01 -35.3661 -62.3226 1.3553 0.0297 6.4957
LittleHopeLH6 2023-09-14 E8_T02 -35.3661 -62.2772 1.7611 0.0231 6.5640
LittleHopeLH6 2023-09-14 E8_T03 -35.3661 -61.0219 2.1628 0.0251 8.7640
LittleHopeLH6 2023-09-14 E8_T04 -35.3661 -59.8631 2.6082 0.0272 11.4441
LittleHopeLH6 2023-09-14 E8_T05 -35.3661 -51.6037 3.0322 0.1568 76.6514
LittleHopeLH6 2023-09-14 E8_T06 -35.3661 -47.5752 2.9330 0.4100 193.8075
LittleHopeLH6 2023-09-14 E8_T07 -35.3661 -56.5231 1.8585 0.0824 24.6933
LittleHopeLH6 2023-09-14 E8_T08 -35.3661 -56.2824 1.9046 0.0850 26.1006
LittleHopeLH6 2023-09-14 E8_T09 -35.3661 -61.8402 2.3810 0.0189 7.2588
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2023-09-26 AS_T01 -35.3911 -46.4871 4.4070 0.2348 247.6004
LittleHopeLH1 2023-09-26 AS_T02 -35.3911 -47.6368 4.5254 0.1755 190.0110
LittleHopeLH1 2023-09-26 AS_T03 -35.3911 -50.9233 4.3862 0.0849 89.1516
LittleHopeLH2 2023-09-27 AS_T04 -35.3911 -44.5976 5.6801 0.3688 382.5551
LittleHopeLH2 2023-09-27 AS_T05 -35.3911 -46.0851 5.6918 0.2613 271.6123
LittleHopeLH2 2023-09-27 AS_T06 -35.3911 -44.8818 6.0790 0.3228 358.3234
LittleHopeLH3 2023-09-26 SH_T01 -35.3911 -58.2427 1.7508 0.0652 50.5147
LittleHopeLH3 2023-09-26 SH_T02 -35.3911 -44.8750 2.0885 1.1863 1,096.9308
LittleHopeLH3 2023-09-26 SH_T03 -35.3911 -46.2881 2.5803 0.6935 792.2765
LittleHopeLH3 2023-09-26 SH_T04 -35.3911 -42.4842 2.3944 1.7943 1,902.2310
LittleHopeLH3 2023-09-26 SH_T05 -35.3911 -45.4462 1.9760 1.0993 961.7460
LittleHopeLH3 2023-09-26 SH_T06 -35.3911 -49.4750 2.0192 0.4254 380.3458
LittleHopeLH3 2023-09-26 SH_T07 -35.3911 -50.4359 2.1413 0.3216 304.8567
LittleHopeLH3 2023-09-26 SH_T08 -35.3911 -46.6895 2.1697 0.7519 722.3188
LittleHopeLH3 2023-09-26 SH_T09 -35.3911 -49.6681 1.4408 0.5703 363.8126
LittleHopeLH3 2023-09-26 SH_T10 -35.3911 -52.1168 1.8502 0.2527 207.0161
LittleHopeLH3 2023-09-26 SH_T11 -35.3911 -52.0959 1.5882 0.2958 208.0133
LittleHopeLH4 2023-09-27 SH_T12 -35.3911 -52.8999 0.6805 0.2204 32.6170
LittleHopeLH4 2023-09-27 SH_T13 -35.3911 -37.4570 0.8814 5.9588 1,142.1933
LittleHopeLH4 2023-09-27 SH_T14 -35.3911 -36.2607 1.1894 5.8156 1,504.4205
LittleHopeLH4 2023-09-27 SH_T15 -35.3911 -41.7311 1.4067 1.3953 426.9026
LittleHopeLH4 2023-09-27 SH_T16 -35.3911 -40.2044 1.3262 2.1036 606.7275
LittleHopeLH4 2023-09-27 SH_T17 -35.3911 -40.0589 1.2919 2.2330 627.3974
LittleHopeLH4 2023-09-27 SH_T18 -35.3911 -52.2779 1.0938 0.1582 37.6399
LittleHopeLH4 2023-09-27 SH_T19 -35.3911 -67.4011 0.5808 0.0092 1.1570
LittleHopeLH5 2023-09-26 E2_T01 -35.3911 -46.6998 3.4013 1.1383 135.9740
LittleHopeLH5 2023-09-26 E2_T02 -35.3911 -43.3664 3.3573 2.4845 292.9509
LittleHopeLH5 2023-09-26 E2_T03 -35.3911 -40.1381 7.3147 2.3981 616.0608
LittleHopeLH5 2023-09-26 E2_T04 -35.3911 -39.5219 7.0424 2.8705 709.9756
LittleHopeLH5 2023-09-26 E2_T05 -35.3911 -45.4962 5.5179 0.9257 179.3968
LittleHopeLH5 2023-09-26 E2_T06 -35.3911 -40.0445 5.3224 3.3675 629.4774
LittleHopeLH5 2023-09-26 E2_T07 -35.3911 -42.4477 5.6983 1.8087 361.9672
LittleHopeLH5 2023-09-26 E2_T08 -35.3911 -49.4737 5.3050 0.3853 71.7895
LittleHopeLH5 2023-09-26 E2_T09 -35.3911 -51.8006 5.1815 0.2309 42.0126
LittleHopeLH5 2023-09-26 E2_T10 -35.3911 -55.5493 4.1901 0.1204 17.7217
LittleHopeLH6 2023-09-27 E8_T01 -35.3911 -50.3106 1.1516 0.4441 59.2072
LittleHopeLH6 2023-09-27 E8_T02 -35.3911 -48.7721 1.5965 0.4566 84.3779
LittleHopeLH6 2023-09-27 E8_T03 -35.3911 -49.9145 1.6976 0.3301 64.8606
LittleHopeLH6 2023-09-27 E8_T04 -35.3911 -46.4678 2.1962 0.5642 143.4347
LittleHopeLH6 2023-09-27 E8_T05 -35.3911 -43.5460 2.0089 1.2087 281.0862
LittleHopeLH6 2023-09-27 E8_T06 -35.3911 -44.2799 2.5327 0.8096 237.3826
LittleHopeLH6 2023-09-27 E8_T07 -35.3911 -40.9878 1.9609 2.2318 506.5894
LittleHopeLH6 2023-09-27 E8_T08 -35.3911 -39.3712 1.7620 3.6037 735.0497
LittleHopeLH6 2023-09-27 E8_T09 -35.3911 -52.2863 0.9703 0.3344 37.5665
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2023-10-07 E8_T01 -35.1643 -63.6981 0.4904 0.0154 1.5283
LittleHopeLH1 2023-10-07 E8_T02 -35.1643 -66.4232 0.7291 0.0055 0.8160
LittleHopeLH1 2023-10-07 E8_T03 -35.1643 -60.4069 0.8236 0.0195 3.2609
LittleHopeLH1 2023-10-07 E8_T04 -35.1643 -60.4236 0.9695 0.0165 3.2483
LittleHopeLH1 2023-10-07 E8_T05 -35.1643 -62.2154 0.9586 0.0111 2.1502
LittleHopeLH1 2023-10-07 E8_T06 -35.1643 -66.4245 0.8310 0.0048 0.8158
LittleHopeLH1 2023-10-07 E8_T07 -35.1643 -72.3170 0.5808 0.0018 0.2100
LittleHopeLH2 2023-10-06 SH_T01 -35.1643 -55.8283 0.9769 0.0643 9.3581
LittleHopeLH2 2023-10-06 SH_T02 -35.1643 -46.0898 1.4352 0.4121 88.1124
LittleHopeLH2 2023-10-06 SH_T03 -35.1643 -37.2894 1.4335 3.1298 668.4593
LittleHopeLH2 2023-10-06 SH_T04 -35.1643 -48.2605 1.2669 0.2832 53.4530
LittleHopeLH2 2023-10-06 SH_T05 -35.1643 -49.4655 1.2799 0.2124 40.5009
LittleHopeLH2 2023-10-06 SH_T06 -35.1643 -55.1949 0.9262 0.0785 10.8275
LittleHopeLH3 2023-10-06 SH_T07 -35.1643 -61.2222 2.6095 0.0110 2.7027
LittleHopeLH3 2023-10-06 SH_T08 -35.1643 -52.8839 2.6684 0.0735 18.4345
LittleHopeLH3 2023-10-06 SH_T09 -35.1643 -57.5964 3.1223 0.0212 6.2284
LittleHopeLH3 2023-10-06 SH_T10 -35.1643 -66.0363 3.1974 0.0030 0.8920
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2023-10-17 AS_T01 -35.9495 -77.2833 0.4846 0.0020 0.4493
LittleHopeLH1 2023-10-17 AS_T02 -35.9495 -68.4619 1.4789 0.0049 3.4248
LittleHopeLH1 2023-10-17 AS_T03 -35.9495 -62.8752 2.0043 0.0132 12.3970
LittleHopeLH1 2023-10-17 AS_T04 -35.9495 -60.0901 2.5248 0.0199 23.5412
LittleHopeLH1 2023-10-17 AS_T05 -35.9495 -60.3506 2.3117 0.0204 22.1704
LittleHopeLH1 2023-10-17 AS_T06 -35.9495 -65.8244 2.7009 0.0050 6.2863
LittleHopeLH1 2023-10-17 AS_T07 -35.9495 -62.3246 1.5062 0.0199 14.0727
LittleHopeLH2 2023-10-17 E8_T01 -35.9495 -68.3147 0.9552 0.0046 1.0723
LittleHopeLH2 2023-10-17 E8_T02 -35.9495 -36.8985 1.1683 5.2057 1,485.7159
LittleHopeLH2 2023-10-17 E8_T03 -35.9495 -36.5521 1.6289 4.0438 1,609.0775
LittleHopeLH2 2023-10-17 E8_T04 -35.9495 -44.1267 1.7712 0.6501 281.2661
LittleHopeLH2 2023-10-17 E8_T05 -35.9495 -44.0987 1.5505 0.7474 283.0842
LittleHopeLH2 2023-10-17 E8_T06 -35.9495 -57.3414 0.4932 0.1114 13.4167
LittleHopeLH3 2023-10-18 E8_T07 -35.9495 -62.1053 1.1761 0.0199 5.8519
LittleHopeLH3 2023-10-18 E8_T08 -35.9495 -59.9127 1.4286 0.0271 9.6951
LittleHopeLH3 2023-10-18 E8_T09 -35.9495 -38.0425 1.0252 5.8055 1,491.3405
LittleHopeLH3 2023-10-18 E8_T10 -35.9495 -32.3556 1.7627 12.5074 5,524.1644
LittleHopeLH3 2023-10-18 E8_T11 -35.9495 -33.3791 1.6911 10.2995 4,364.2339
LittleHopeLH3 2023-10-18 E8_T12 -35.9495 -33.4297 1.7694 9.7303 4,313.7671
LittleHopeLH3 2023-10-18 E8_T13 -35.9495 -59.2725 0.7843 0.0572 11.2351
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
LittleHopeLH1 2023-10-30 E8_T01 -35.9495 -54.3847 1.6464 0.1404 57.8745
LittleHopeLH1 2023-10-30 E8_T02 -35.9495 -51.1728 2.0181 0.2399 121.2498
LittleHopeLH1 2023-10-30 E8_T03 -35.9495 -46.4762 1.8581 0.7684 357.5563
LittleHopeLH1 2023-10-30 E8_T04 -35.9495 -46.5068 1.9861 0.7138 355.0400
LittleHopeLH1 2023-10-30 E8_T05 -35.9495 -49.4575 1.6834 0.4269 179.9733
LittleHopeLH1 2023-10-30 E8_T06 -35.9495 -46.8268 1.9198 0.6860 329.8229
LittleHopeLH1 2023-10-30 E8_T07 -35.9495 -47.1361 1.7846 0.6872 307.1513
LittleHopeLH1 2023-10-30 E8_T08 -35.9495 -52.1766 1.3922 0.2760 96.2277
LittleHopeLH1 2023-10-30 E8_T09 -35.9495 -53.0779 0.8058 0.3875 78.1927
LittleHopeLH1 2023-10-30 E8_T10 -35.9495 -56.9678 0.7942 0.1605 31.9284
LittleHopeLH1 2023-10-30 E8_T11 -35.9495 -65.4524 0.2295 0.0787 4.5261

Notes

No additional notes for this area.

Eastern Shore

Summary

Table. Summary of the 2023 Eastern Shore spawning ground acoustic survey data from all surveys and associated biomass estimates. A maximum biomass estimate value is taken when that are less than 10 days, instead, a single value is used in the reported biomass estimates for 10 day intervals.

Location Date Interval (days) Target Strength (dB/kg) Area (km2) Mean Sa (dB/m2) Biomass (t) Standard Error (t) St. Err %
Eastern Shore #1 2023-09-23 -35.9495 0 -43.87 11,361 17 35
Eastern Shore #2 2023-10-03 10 -35.6790 2 -40.44 9,721 324 40
Eastern Shore #3 2023-10-13 10 -35.7290 1 -44.87 4,452 15 12
Eastern Shore #4 2023-10-27 14 -35.9495 7 -45.53 1,549 87 11
Eastern Shore #5 2023-11-07 11 -35.9495 0 -33.34 973 417 54
Summary 2 -41.61 28,057 2,099 7

Length Frequency

Figure. Length distribution used for calculation of TS for the Eastern Shore acoustic surveys in 2023 with proportions <23cm and >30cm shown as white and grey bars.

Maturity Samples

Figure. Herring maturity samples collected during Eastern Shore surveys in 2023 to determine proportion of individuals spawning for Eastern Shore acoustic index of spawning stock biomass. Stage codes are: 1-2 Immature, 3-5 Ripening or Ripe. 6, Spawning, 7 Spent, and 8-9 Recovering.

Target Strength

Table. Summary of 2023 fish sampled for Eastern Shore by survey date and location with TS estimate from samples and TS estimate for a 28 cm herring using the length/weight equation.

Location of survey Interval (days) Date No. of Len. Samp. No. of Det. Samp. No. Len/Wt Fish No. of Fish Measured Mean Length (mm) Mean Weight (g) Target Strength (dB/kg) Wt 28 cm Fish (g) TS 28 cm Fish (dB/kg)
Eastern Shore #1 Sep - 23 -35.5000
Eastern Shore #2 10 Oct - 3 2 2 59 331 280 169 -35.2295 169 -35.2295
Eastern Shore #3 10 Oct - 13 2 2 46 328 285 177 -35.2795 167 -35.1901
Eastern Shore #4 14 Oct - 27 -35.5000
Eastern Shore #5 11 Nov - 7 -35.5000

NASC Plots

NASC - Nautical Area Scattering Strength

Figure. Herring NASC’s by 2 nautical mile intervals during the 2023 Eastern Shore acoustic surveys.

SSB Bubble Plots

SSB - Spawning Stock Biomass

Figure. Spawning Stock Biomass (proportional to size of a bubble plot) in thousands Eastern Shore acoustic survey by day in the year. Note that SSB on this figure have not been adjusted by the turnover equations and neighboring survey times may be temporally auto-correlated.

Work in Progress - Years with missing Bubbles have not been added to the database.

Survey Details

Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2023-09-23 ZP_T01 -35.9495 -46.5764 0.9681 0.2700 25.8660
EasternShoreES1 2023-09-23 ZP_T02 -35.9495 -49.0699 1.0399 0.1416 14.5675
EasternShoreES1 2023-09-23 ZP_T03 -35.9495 -51.7818 1.0119 0.0779 7.8017
EasternShoreES2 2023-09-23 ZP_T04 -35.9495 -50.1790 1.3185 0.3021 49.1106
EasternShoreES2 2023-09-23 ZP_T05 -35.9495 -45.9538 1.2756 0.8263 129.9253
EasternShoreES2 2023-09-23 ZP_T06 -35.9495 -44.3576 1.2014 1.2669 187.6348
EasternShoreES2 2023-09-23 ZP_T07 -35.9495 -56.6028 1.1145 0.0814 11.1892
EasternShoreES2 2023-09-23 ZP_T08 -35.9495 -54.5640 0.7539 0.1925 17.8927
EasternShoreES2 2023-09-23 ZP_T09 -35.9495 -49.3841 1.0307 0.4641 58.9746
EasternShoreES2 2023-09-23 ZP_T10 -35.9495 -53.1590 0.9634 0.2082 24.7273
EasternShoreES2 2023-09-23 ZP_T11 -35.9495 -57.1368 0.9372 0.0856 9.8945
EasternShoreES2 2023-09-23 ZP_T12 -35.9495 -56.1297 0.9263 0.1093 12.4769
EasternShoreES2 2023-09-23 ZP_T13 -35.9495 -54.1319 1.0284 0.1559 19.7642
EasternShoreES3 2023-09-23 ZP_T14 -35.9495 -54.2657 1.1794 0.0538 13.7940
EasternShoreES3 2023-09-23 ZP_T15 -35.9495 -52.0205 1.0875 0.0978 23.1322
EasternShoreES3 2023-09-23 ZP_T16 -35.9495 -51.7358 1.0087 0.1126 24.6993
EasternShoreES3 2023-09-23 ZP_T17 -35.9495 -52.0535 1.0289 0.1026 22.9571
EasternShoreES4 2023-09-22 EA_T01 -35.9495 -47.3147 7.2485 0.1342 945.1406
EasternShoreES4 2023-09-22 EA_T02 -35.9495 -49.5874 6.0765 0.0949 560.0440
EasternShoreES5 2023-09-22 EA_T03 -35.9495 -47.8499 2.0930 0.2333 71.7920
EasternShoreES5 2023-09-22 EA_T04 -35.9495 -46.0082 1.7032 0.4381 109.7079
EasternShoreES5 2023-09-22 EA_T05 -35.9495 -44.6970 1.9701 0.5122 148.3744
EasternShoreES5 2023-09-22 EA_T06 -35.9495 -49.6527 1.7971 0.1794 47.4015
EasternShoreES6 2023-09-23 EA_T07 -35.9495 -48.7729 2.9315 0.3569 349.0633
EasternShoreES6 2023-09-23 EA_T08 -35.9495 -45.9675 2.6660 0.7487 665.9509
EasternShoreES6 2023-09-23 EA_T09 -35.9495 -44.0364 2.9203 1.0662 1,038.8419
EasternShoreES6 2023-09-23 EA_T10 -35.9495 -43.2706 2.7120 1.3695 1,239.1710
EasternShoreES6 2023-09-23 EA_T11 -35.9495 -46.7182 2.7870 0.6025 560.2406
EasternShoreES6 2023-09-23 EA_T12 -35.9495 -48.1749 2.5665 0.4678 400.5890
EasternShoreES6 2023-09-23 EA_T13 -35.9495 -50.6178 2.3932 0.2859 228.2509
EasternShoreES6 2023-09-23 EA_T14 -35.9495 -51.5785 1.0665 0.5142 182.9533
EasternShoreES7 2023-09-23 OH_T01 -35.9495 -46.4708 2.0149 0.4797 365.5320
EasternShoreES7 2023-09-23 OH_T02 -35.9495 -46.2567 2.0221 0.5021 383.9999
EasternShoreES7 2023-09-23 OH_T03 -35.9495 -46.9167 3.0659 0.2845 329.8633
EasternShoreES7 2023-09-23 OH_T04 -35.9495 -49.9226 2.3339 0.1870 165.0966
EasternShoreES7 2023-09-23 OH_T05 -35.9495 -51.2854 1.4605 0.2184 120.6317
EasternShoreES8 2023-09-23 OH_T06 -35.9495 -50.3251 2.4791 0.2858 234.7513
EasternShoreES8 2023-09-23 OH_T07 -35.9495 -50.5602 2.6055 0.2576 222.3803
EasternShoreES8 2023-09-23 OH_T08 -35.9495 -48.5351 2.7507 0.3890 354.4973
EasternShoreES8 2023-09-23 OH_T09 -35.9495 -48.9991 2.9675 0.3240 318.5753
EasternShoreES8 2023-09-23 OH_T10 -35.9495 -49.5006 2.1413 0.4001 283.8290
EasternShoreES8 2023-09-23 OH_T11 -35.9495 -48.3822 2.1517 0.5151 367.1965
EasternShoreES8 2023-09-23 OH_T12 -35.9495 -47.4450 2.2348 0.6154 455.6353
EasternShoreES8 2023-09-23 OH_T13 -35.9495 -46.5755 2.0764 0.8092 556.6276
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2023-10-03 VE_T01 -35.679 -46.5910 2.0556 0.1892 194.4883
EasternShoreES1 2023-10-03 VE_T02 -35.679 -42.4480 1.6913 0.5971 504.8925
EasternShoreES1 2023-10-03 VE_T03 -35.679 -49.3710 1.0523 0.1949 102.5417
EasternShoreES2 2023-10-03 VE_T04 -35.679 -51.4261 0.5396 0.2389 59.5147
EasternShoreES2 2023-10-03 VE_T05 -35.679 -49.6949 1.0471 0.1834 88.6625
EasternShoreES2 2023-10-03 VE_T06 -35.679 -44.4926 1.7133 0.3713 293.7457
EasternShoreES2 2023-10-03 VE_T07 -35.679 -48.4406 1.5410 0.1663 118.3505
EasternShoreES3 2023-10-03 VE_T08a -35.679 -51.1827 0.7507 0.2759 75.3664
EasternShoreES3 2023-10-03 VE_T08b -35.679 -48.9567 1.6859 0.2051 125.8286
EasternShoreES3 2023-10-03 VE_T09 -35.679 -43.6773 2.8693 0.4064 424.3419
EasternShoreES3 2023-10-03 VE_T10 -35.679 -48.3425 2.0481 0.1945 144.9431
EasternShoreES4 2023-10-03 OH_T01 -35.679 -55.9598 1.9589 0.1356 63.1168
EasternShoreES4 2023-10-03 OH_T02 -35.679 -53.5816 1.8652 0.2463 109.1357
EasternShoreES4 2023-10-03 OH_T03 -35.679 -52.0966 1.8927 0.3416 153.6261
EasternShoreES4 2023-10-03 OH_T04 -35.679 -55.5669 1.7259 0.1685 69.0932
EasternShoreES4 2023-10-03 OH_T05 -35.679 -50.7403 1.6097 0.5489 209.9421
EasternShoreES4 2023-10-03 OH_T06 -35.679 -53.1279 1.7891 0.2850 121.1522
EasternShoreES4 2023-10-03 OH_T07 -35.679 -49.6808 1.7508 0.6441 267.9440
EasternShoreES4 2023-10-03 OH_T08 -35.679 -53.0691 1.8539 0.2788 122.8044
EasternShoreES4 2023-10-03 OH_T09 -35.679 -49.8849 2.0933 0.5140 255.6441
EasternShoreES4 2023-10-03 OH_T10 -35.679 -49.8805 1.8572 0.5800 255.9006
EasternShoreES4 2023-10-03 OH_T11 -35.679 -51.3655 1.7690 0.4325 181.7934
EasternShoreES4 2023-10-03 OH_T12 -35.679 -51.6415 1.9186 0.3743 170.5995
EasternShoreES4 2023-10-03 OH_T13 -35.679 -52.9426 1.5036 0.3539 126.4329
EasternShoreES4 2023-10-03 OH_T14 -35.679 -54.8186 1.6632 0.2077 82.0860
EasternShoreES4 2023-10-03 OH_T15 -35.679 -52.4799 2.3531 0.2516 140.6470
EasternShoreES4 2023-10-03 OH_T16 -35.679 -58.7492 0.7361 0.1899 33.2052
EasternShoreES5 2023-10-03 OH_T17 -35.679 -47.8617 0.6317 0.4320 31.3799
EasternShoreES5 2023-10-03 OH_T18 -35.679 -38.4424 0.6153 3.8799 274.5227
EasternShoreES5 2023-10-03 OH_T19 -35.679 -41.2902 0.5222 2.3733 142.4955
EasternShoreES5 2023-10-03 OH_T20 -35.679 -44.3523 0.5578 1.0976 70.4031
EasternShoreES5 2023-10-03 OH_T21 -35.679 -41.9914 0.5966 1.7675 121.2481
EasternShoreES5 2023-10-03 OH_T22 -35.679 -41.5820 0.6087 1.9036 133.2349
EasternShoreES5 2023-10-03 OH_T23 -35.679 -47.1735 0.6254 0.5113 36.7677
EasternShoreES5 2023-10-03 OH_T24 -35.679 -74.3873 0.3532 0.0017 0.0698
EasternShoreES6 2023-10-03 ZP_T01 -35.679 -57.6066 1.2637 0.1732 33.8952
EasternShoreES6 2023-10-03 ZP_T02 -35.679 -57.1860 1.1219 0.2149 37.3413
EasternShoreES6 2023-10-03 ZP_T03 -35.679 -56.8822 1.5837 0.1633 40.0474
EasternShoreES6 2023-10-03 ZP_T04 -35.679 -56.5504 1.8337 0.1522 43.2266
EasternShoreES6 2023-10-03 ZP_T05 -35.679 -53.8916 1.9991 0.2576 79.7325
EasternShoreES6 2023-10-03 ZP_T06 -35.679 -53.4823 2.0005 0.2828 87.6118
EasternShoreES6 2023-10-03 ZP_T07 -35.679 -50.9530 2.0381 0.4970 156.8520
EasternShoreES6 2023-10-03 ZP_T08 -35.679 -49.0857 1.8301 0.8508 241.1132
EasternShoreES6 2023-10-03 ZP_T09 -35.679 -45.8543 1.7874 1.8333 507.4107
EasternShoreES6 2023-10-03 ZP_T10 -35.679 -45.2936 1.7387 2.1444 577.3460
EasternShoreES6 2023-10-03 ZP_T11 -35.679 -51.2469 1.6866 0.5613 146.5903
EasternShoreES6 2023-10-03 ZP_T12 -35.679 -50.9220 1.4811 0.6888 157.9770
EasternShoreES6 2023-10-03 ZP_T13 -35.679 -52.4601 1.4963 0.4785 110.8631
EasternShoreES6 2023-10-03 ZP_T14 -35.679 -54.2068 0.9210 0.5199 74.1509
EasternShoreES6 2023-10-03 ZP_T15 -35.679 -50.0141 1.3932 0.9026 194.7064
EasternShoreES6 2023-10-03 ZP_T16 -35.679 -52.4702 1.2879 0.5546 110.6050
EasternShoreES6 2023-10-03 ZP_T17 -35.679 -48.2291 1.4992 1.2650 293.6869
EasternShoreES6 2023-10-03 ZP_T18 -35.679 -52.4985 1.3032 0.5445 109.8857
EasternShoreES6 2023-10-03 ZP_T19 -35.679 -53.2957 1.8200 0.3245 91.4593
EasternShoreES6 2023-10-03 ZP_T20 -35.679 -55.2715 1.7489 0.2143 58.0294
EasternShoreES6 2023-10-03 ZP_T21 -35.679 -55.6730 2.2843 0.1496 52.9047
EasternShoreES7 2023-10-03 EA_T01 -35.679 -50.6340 1.2190 0.3100 94.6911
EasternShoreES7 2023-10-03 EA_T02 -35.679 -46.4120 2.2343 0.4471 250.3290
EasternShoreES7 2023-10-03 EA_T03 -35.679 -49.6578 2.2615 0.2092 118.5569
EasternShoreES7 2023-10-03 EA_T04 -35.679 -48.8383 3.1422 0.1818 143.1787
EasternShoreES7 2023-10-03 EA_T05 -35.679 -50.5371 2.9691 0.1301 96.8267
EasternShoreES8 2023-10-03 EA_T06 -35.679 -52.3277 1.0186 0.1888 27.8312
EasternShoreES8 2023-10-03 EA_T07 -35.679 -47.8064 1.1599 0.4696 78.8239
EasternShoreES8 2023-10-03 EA_T08 -35.679 -51.9189 1.0207 0.2070 30.5783
EasternShoreES8 2023-10-03 EA_T09 -35.679 -49.7276 1.0678 0.3277 50.6462
EasternShoreES8 2023-10-03 EA_T10 -35.679 -49.2593 1.0971 0.3553 56.4116
EasternShoreES8 2023-10-03 EA_T11 -35.679 -49.0000 1.2654 0.3270 59.8831
EasternShoreES8 2023-10-03 EA_T12 -35.679 -52.2882 0.7174 0.2705 28.0857
EasternShoreES8 2023-10-03 EA_T13 -35.679 -52.0578 0.7470 0.2740 29.6158
EasternShoreES8 2023-10-03 EA_T14 -35.679 -52.7435 0.7958 0.2196 25.2903
EasternShoreES9 2023-10-02 EA_T15 -35.679 -46.9552 0.7116 0.4285 32.5133
EasternShoreES9 2023-10-02 EA_T16 -35.679 -47.7679 0.7052 0.3585 26.9644
EasternShoreES9 2023-10-02 EA_T17 -35.679 -46.9064 0.6655 0.4633 32.8812
EasternShoreES9 2023-10-02 EA_T18 -35.679 -51.0159 0.6038 0.1982 12.7641
EasternShoreES9 2023-10-02 EA_T19 -35.679 -52.6466 0.6115 0.1345 8.7684
EasternShoreES9 2023-10-02 EA_T20 -35.679 -55.0151 0.5511 0.0865 5.0824
EasternShoreES9 2023-10-02 EA_T21 -35.679 -66.0390 0.2415 0.0156 0.4015
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2023-10-13 ZP_T01 -35.729 -56.5323 0.7390 0.0797 8.2964
EasternShoreES1 2023-10-13 ZP_T02 -35.729 -55.5310 0.8711 0.0852 10.4476
EasternShoreES1 2023-10-13 ZP_T03 -35.729 -55.5285 0.6949 0.1069 10.4536
EasternShoreES1 2023-10-13 ZP_T04 -35.729 -54.9962 0.8000 0.1049 11.8166
EasternShoreES1 2023-10-13 ZP_T05 -35.729 -53.7075 0.7376 0.1531 15.8988
EasternShoreES1 2023-10-13 ZP_T06 -35.729 -53.7697 0.7089 0.1571 15.6729
EasternShoreES1 2023-10-13 ZP_T07 -35.729 -52.8460 0.6621 0.2080 19.3874
EasternShoreES1 2023-10-13 ZP_T08 -35.729 -55.4186 0.9727 0.0783 10.7216
EasternShoreES1 2023-10-13 ZP_T09 -35.729 -52.9203 0.9050 0.1496 19.0585
EasternShoreES2 2023-10-13 ZP_T10 -35.729 -50.7986 0.9197 0.3885 38.2784
EasternShoreES2 2023-10-13 ZP_T11 -35.729 -55.0258 0.9927 0.1360 14.4620
EasternShoreES2 2023-10-13 ZP_T12 -35.729 -61.9336 0.9240 0.0298 2.9475
EasternShoreES2 2023-10-13 ZP_T13 -35.729 -61.2380 0.7911 0.0408 3.4595
EasternShoreES2 2023-10-13 ZP_T14 -35.729 -56.5296 0.8618 0.1108 10.2294
EasternShoreES2 2023-10-13 ZP_T15 -35.729 -67.0376 0.8621 0.0099 0.9100
EasternShoreES2 2023-10-13 ZP_T16 -35.729 -54.7764 0.7263 0.1969 15.3169
EasternShoreES2 2023-10-13 ZP_T17 -35.729 -44.7544 0.7793 1.8440 153.9466
EasternShoreES2 2023-10-13 ZP_T18 -35.729 -44.1159 0.9568 1.7398 178.3283
EasternShoreES2 2023-10-13 ZP_T19 -35.729 -38.8493 0.9164 6.1080 599.6231
EasternShoreES2 2023-10-13 ZP_T20 -35.729 -40.2234 1.0268 3.9729 436.9910
EasternShoreES2 2023-10-13 ZP_T21 -35.729 -42.1635 0.9624 2.7115 279.5506
EasternShoreES2 2023-10-13 ZP_T22 -35.729 -66.0644 0.7627 0.0139 1.1386
EasternShoreES3 2023-10-13 VE_T01 -35.729 -39.5277 1.1172 1.2896 454.6537
EasternShoreES3 2023-10-13 VE_T02 -35.729 -33.8391 1.2408 4.3027 1,684.7997
EasternShoreES3 2023-10-13 VE_T03 -35.729 -50.1050 1.0970 0.1150 39.8065
EasternShoreES4 2023-10-12 EA_T01 -35.729 -67.6729 3.2708 0.0017 11.5966
EasternShoreES4 2023-10-12 EA_T02 -35.729 -52.2916 5.2505 0.0358 400.3702
EasternShoreES5 2023-10-13 EA_T03 -35.729 -58.9622 0.8021 0.0109 2.2007
EasternShoreES5 2023-10-13 EA_T04 -35.729 -60.5784 0.6579 0.0092 1.5168
EasternShoreES5 2023-10-13 EA_T05 -35.729 -65.1770 0.3806 0.0055 0.5261
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2023-10-27 ZP_T01 -35.9495 -61.4024 1.1878 0.0794 20.5853
EasternShoreES1 2023-10-27 ZP_T02 -35.9495 -59.2347 1.6767 0.0927 33.9098
EasternShoreES1 2023-10-27 ZP_T03 -35.9495 -55.7065 2.0564 0.1703 76.4089
EasternShoreES1 2023-10-27 ZP_T04 -35.9495 -55.2161 1.6983 0.2309 85.5436
EasternShoreES1 2023-10-27 ZP_T05 -35.9495 -55.3671 2.2453 0.1687 82.6191
EasternShoreES1 2023-10-27 ZP_T06 -35.9495 -60.4810 1.8023 0.0647 25.4502
EasternShoreES1 2023-10-27 ZP_T07 -35.9495 -59.2096 1.6145 0.0968 34.1058
EasternShoreES1 2023-10-27 ZP_T08 -35.9495 -60.8692 1.6688 0.0639 23.2740
EasternShoreES1 2023-10-27 ZP_T09 -35.9495 -56.7537 1.9938 0.1380 60.0380
EasternShoreES1 2023-10-27 ZP_T10 -35.9495 -59.1817 2.0750 0.0758 34.3259
EasternShoreES1 2023-10-27 ZP_T11 -35.9495 -55.5660 2.5544 0.1416 78.9217
EasternShoreES1 2023-10-27 ZP_T12 -35.9495 -62.1362 1.9984 0.0399 17.3848
EasternShoreES1 2023-10-27 ZP_T13 -35.9495 -56.4118 2.6997 0.1103 64.9546
EasternShoreES1 2023-10-27 ZP_T14 -35.9495 -60.5578 1.2692 0.0903 25.0043
EasternShoreES1 2023-10-27 ZP_T15 -35.9495 -56.3724 2.1997 0.1366 65.5468
EasternShoreES1 2023-10-27 ZP_T16 -35.9495 -59.1806 2.1596 0.0729 34.3345
EasternShoreES1 2023-10-27 ZP_T17 -35.9495 -59.2670 2.2215 0.0695 33.6584
EasternShoreES2 2023-10-27 VE_T01 -35.9495 -47.8093 0.9031 0.3484 90.4438
EasternShoreES2 2023-10-27 VE_T02 -35.9495 -42.3047 1.2135 0.9209 321.2502
EasternShoreES2 2023-10-27 VE_T03 -35.9495 -46.0733 0.9558 0.4909 134.8895
EasternShoreES2 2023-10-27 VE_T04 -35.9495 -44.4785 0.9470 0.7153 194.7439
EasternShoreES2 2023-10-27 VE_T05 -35.9495 -56.7231 0.8085 0.0500 11.6144
Location Date Transect Number Target Strength (dB/kg) Mean Sa (dB/m^2) Distance (km) Biomass Density kg/m^2 Biomass (t)
EasternShoreES1 2023-11-07 EA_T01 -35.9495 -51.0683 0.5740 0.1744 12.9727
EasternShoreES1 2023-11-07 EA_T02 -35.9495 -44.6776 0.6662 0.6547 56.5070
EasternShoreES1 2023-11-07 EA_T03 -35.9495 -35.5817 0.6757 5.2421 458.8673
EasternShoreES1 2023-11-07 EA_T04 -35.9495 -51.5143 0.7036 0.1284 11.7065
EasternShoreES1 2023-11-07 EA_T05 -35.9495 -38.6135 0.6348 2.7759 228.3003
EasternShoreES2 2023-11-07 VE_T01 -35.9495 -55.3703 0.5428 0.0641 10.3965
EasternShoreES2 2023-11-07 VE_T02 -35.9495 -57.4747 0.5224 0.0411 6.4038
EasternShoreES2 2023-11-07 VE_T03 -35.9495 -56.0431 1.3475 0.0221 8.9044
EasternShoreES2 2023-11-07 VE_T04FF -35.9495 -68.4903 0.6341 0.0027 0.5069
EasternShoreES3 2023-11-07 VE_T05a -35.9495 -62.8603 0.4566 0.0182 2.9369
EasternShoreES3 2023-11-07 VE_T05b -35.9495 -65.8032 0.4884 0.0086 1.4914
EasternShoreES3 2023-11-07 VE_T05c -35.9495 -55.1922 0.4547 0.1066 17.1672
EasternShoreES3 2023-11-07 VE_T06 -35.9495 -45.7490 1.7376 0.2454 151.0161
EasternShoreES3 2023-11-07 VE_T07 -35.9495 -59.5644 0.9340 0.0190 6.2731

Notes

No additional notes for this area.

About

This report was generated on: 2024-02-29 08:56:18
dplyr R package version 1.1.2
kableExtra R package version 1.3.4
ggplot2 R package version 3.4.2
DT R package version 0.28
R version 4.2.0 Patched (2022-05-30 r82437 ucrt)